Unlocking the bootloader xiaomi mi 4s error 50. How to unlock the bootloader Xiaomi and why you need it

If you confidently use the Android operating system and MIUI firmware, then most likely you know that for this you need an unlocked Xiaomi bootloader. It offers many benefits on smartphones such as:

Significantly facilitating work with the device - you can install any scripts, modules and firmware.
The ability to install unofficial recovery on a smartphone.
Quick and hassle-free getting root rights for an unlocked gadget, which make it possible to customize the gadget for yourself.

Before loading custom firmware on your Xiaomi, first make sure the bootloader is unlocked. In this article we will answer the question "How to unlock bootloader" and why is it needed.

Check via phone: Settings - About device- multiple tap on the menu item "Kernel" - Software version... In line "Fastboot lock state" the state of the bootloader will be written.
Through a PC on Windows: first, the phone must boot into fastboot mode (power key + volume down key) - to do this, connect your gadget to your computer - on a PC, press Win + R - enter "Cmd"- in the command line field, write "Adb"- press Enter - enter "Fastboot oem device-info"... The screen will display information about the status of the bootloader check.
Via PC on Linux, Ubuntu OS: write in the terminal adb- then apt-get install android-tools-adb android-tools-fastboot- start fastboot on your smartphone (power and volume down button). In field "Sudo fastboot devices" your device number will pop up in the field "Sudo fastboot oem device-info"- bootloader status. If you see the inscription "Waiting for device", then try again as administrator.

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Obtaining permits

In order to unlock the MIUI bootloader, you need to obtain permission for this unlocking. To do this, go to en.miui.com/unlock and click on the button in the middle of the screen. Then follow the instructions:

Log in to your account.
Sometimes you can be redirected to the download page of the unlocking utility, and sometimes the site will require you to fill out an unlocking form in English.
Place the bird, confirm your choice.
Enter the SMS confirmation code into the appropriate field and click "Next".

You will see a message stating that the application was successfully submitted. Expect a response either via SMS, or (best of all) regularly track the status of the application at miui.com/unlock/apply.php. This method is official, but sometimes there are some problems on Xiaomi - in this case, just reinstall the drivers and unlock the bootloader again.

Unlocking process

Suppose that you have received official permission from the developer, now it remains to answer the main question: how to unlock the bootloader.

If at the end of the process you want to immediately install custom firmware, then download it immediately and save the archive to your smartphone.
It is necessary to download the utility for unlocking bootloaders.
Turn off the phone, then hold down the on / off button of the device and the volume down.
Connect your smartphone to a PC via USB.
Open MiFlash Unlock, agree to the rules by clicking the checkmark and accepting the terms.
Enter your personal Mi ID (not a phone number!) And your password. Sign in to the system.
Wait while the program detects the device and click "Unblock".
Done, you have unlocked the Xiaomi bootloader and you can install any firmware.

Most popular unlock questions

Will my data be deleted? - No, they will remain in place.
If I have a new Xiaomi smartphone, how can I unlock it too? - Wait a month after the old phone has been unlocked. Go to the Mi Unlock program using your username and password and unlock it. You do not have to submit an application - from an approved account, you can block monthly from one device.
How long does it take to unlock? - Often, Xiaomi servers approve an application for about 10 days, and then another 10 days the data will be synchronized. The main thing is to comply with the basic conditions, such as: synchronization of the phone with the Mi-account and Mi Cloud, the developer's firmware must be installed on it (weekly).
When unlocking, I am shown a notification that "Find device" and "The fingerprint scanner" will not be available. Why did the program block these functions? - Don't worry, these are only translation costs. The functions will work, they will just be slightly less secure, because the standard protection on the bootloader will be disabled.
How do I lock the bootloader back? - Download the Mi Flash utility and flash the gadget with the official MIUI firmware, after checking the box "Clean all and lock".
Do i need a SIM card? - No, you can unlock the bootloader without it.
For how long is the permission to unlock issued? - Forever.

conclusions

Those users who for a long time could not install custom software on their locked gadget can now breathe a sigh of relief - Xiaomi unlock bootloader is now made easy. This unlocking method is suitable for any Xiaomi smartphones.

I was surprised how easy the whole procedure is. I even talked about this using the example of describing the firmware process for Xiaomi Mi4. Downloading to a fastboot, installing a third-party recovery, and then rolling out the selected firmware, which are in abundance on various fan sites. After dancing with HTC and the like - simplicity itself.

But happiness cannot last forever, because at some point the Chinese began to block the bootloader of their devices, and therefore the firmware process became somewhat complicated. However, not enough to completely abandon this process, if you really really want to :)

And at the same time setting out on the pages of the site all the accumulated experience gained during the googling of how to solve my problem of opening a smartphone bootloader. However, the instructions will be valid for all other smartphones of the company.

How to unlock Xiaomi bootloader

What to do if “Couldn’t verify device. Can't get info, connect again "

The process seems to have gone, but when it reaches 50% it stops, an error falls out. It's not at all a fact that this is a problem with Xiaomi servers, which for some reason cannot give you information. Most likely you are the problem. I got two at once.

Make sure you are using the exact account for which Xiaomi gave you permission to unlock. It so happened that once upon a time I registered two accounts for my smartphone and, entering either phone or email as a login, got into different accounts on the i.mi.com website. Be carefull. The correct digital ID is listed in the MiFlashUnlock application.
Unlocking will only be given if you have an official firmware. Global or Chinese, it doesn't matter. But, if in the store or the Chinese who sold you on Aliexpress, they washed down something of their own, or you installed some kind of fan assembly, for example, with full localization and optimizations, it is possible to hammer into Chinese servers for a long time and to no avail.
Sometimes Windows itself does not see your smartphone connected via USB. Yes, it does happen, so you might find it useful. Check your drivers. Some people advise installing the Mi PC Suite application as well.
Another method of struggle is called the activation of settings for the developer in the system. Remember how to do this? We go into the information about the system and tap on the firmware version several times until the mode is activated. Next, we look for developer options in the general system settings and activate the switch to the "OEM Unlocking" position there. In addition, you need to delete all fingerprints, if you have been added, and also disable the smartphone lock by password, pattern or pin code.
The last point, if none of the above worked, seems quite straightforward. And, possibly, it is connected with some blunting of the Chinese servers. Many, according to the official Xiaomi forum, are saved simply by logging into the Mi-account through the browser, and then ping the phone with the "Find Phone" function. After it is possible to track the location of the gadget, the verification process easily passes the 50% mark. I saw it myself! Not at home, but on Youtube.

Succeeded!

Now, when the bootloader of your Xiaomi smartphone is unlocked, you can decide what kind of firmware you want to roll onto your gadget. Or start pampering yourself with advanced system management rights,.

If this instruction turned out to be useful to you, we will be glad to your comment or click on the like and +1 buttons. So we did not try in vain.

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Since Xiaomi's products are officially supplied to a limited number of countries, and sometimes not all models common in the Chinese market arrive there, users are ready to mine these devices in all sorts of ways, not always legal, often trying to save money. This leads to the fact that they have to deal with fakes, an unofficial operating system, viruses. For this reason, Xiaomi has officially announced its decision to block Bootloader.

In addition to the above, such blocking is also due to the protection of users' personal information in case of loss or theft of smartphones. In practice, attackers who specialize in such thefts can easily gain access to the gadget's data, but if the bootloader is locked, this will significantly complicate its task due to the smartphone being linked to the Mi account.

The blocked Bootloader does not affect the official Chinese update in any way, but ROOT will become unavailable. To enable it, the user will need to deal with unlocking the bootloader. In addition, Recovery and Mi Flash updates are no longer available.

Today, there is an official instruction for unlocking the device bootloaders. To begin with, the user needs to obtain permission for this procedure, which is achieved by the following actions:

Login to the official website of the company in your personal account at the link http://en.miui.com/unlock/;
An inscription on the blue field "Unlock your mi device" should appear on the screen, immediately below which is the only button "Unlock now" that you need to press;
After clicking the button, you will go to the authorization page or to the download page of the MiFlashUnlock application, if the user has previously gained access to the unlock or has a high rank on the Gold Member forum;
If there is no access yet, fill in the authorization fields - all fields, including the name, are filled in English;
In the field with the request, you can use the standard phrase: "I want to install ROM from MIUI Russia fan site";
We put a tick on the box with the consent to the terms and click on the "Apply now" button.

This is the standard procedure for working at the first stage, at which it is important to follow the sequence of actions, carefully and correctly fill in all the fields without exception, so that at the initial level you do not ensure yourself a refusal.

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Following instructions

Further, after authorization, a page will open, where the user must manually enter the identity verification code that came to him on his mobile number, which he also indicated. After entering the code, the request will be officially accepted for consideration.

Checking the sent request for MIUI and unlock, in particular, is checked within two to ten days. If the application is approved, it will be notified by SMS to the same number that was originally indicated. However, the status of request processing can be checked independently on Mi unlock status by following the link http://www.miui.com/unlock/apply.php.

After the official receipt of permission to unlock Bootloader, the task is not solved automatically, this only enables the user to proceed to the next stage, where he needs:

Download the latest MIUI firmware update on Recovery;
Download downloaded to your smartphone and open the unlock program (Updater);
Press the Menu section and select the firmware file.

It is important to keep in mind that after the update, all data from the smartphone will be deleted, for this reason, do not forget about the backup. But even at this stage, the device has not yet unlocked the bootloader.

Final stages

After the new firmware is installed, you need to re-authorize on the same unlock mi device using the link that was indicated at the beginning. After logging into your account, you need to download the Mi Flash Unlock application in apk format. from the official site.

Current download options:

Mi Flash Unlock EN miui unlock - English version.
Mi Flash Unlock RU - Russian version.
There are options for the EU, but this is irrelevant in the Russian Federation.

After that, you need to turn on your smartphone, hold down the volume down and power buttons at the same time and hold until Fastboot mode turns on. Next, the device needs to be connected via a USB cable to the computer, the application is launched on the unlock (one of the two above), read the conditions and click on the "Accept" button.

Immediately after this, a special window will appear on the screen for manually entering data on an existing Mi account - at this stage it is important to know its ID and your password. After authorization, the availability of permission will be checked and, if there is an approving status and an inscription about connecting the device, we press the green button "Unblock".

Duration of unlocking ˗ about ten seconds. After finishing from the official or other site, you can update the smartphone's firmware. And, what else should be remembered, during one month you can use the unblocking right only once.

Eliminating errors

When unlocking the bootloader on their device, many, due to carelessness or other reasons, make mistakes, as a result of which they cannot get the desired resolution. The most common ones can be solved as follows:

The percentage of refusals in obtaining permission to unlock the bootloader is not so high, but due to your own carelessness, you can tinker with this procedure for a very, very long time.

Many are interested in the question of how to unlock the Xiaomi bootloader, what is it for and what benefits the user receives. After all, the procedure is quite complex and multifaceted. Let's try to figure out what the unlocked bootloader will give, read the instructions, tips, tips and try to avoid possible problems.

ATTENTION! Important information about the bootloader. At the moment, the procedure for obtaining approval has been simplified. You do not need to fill out an application.

Download the program, link Mi account with your phone in the settings (the developer is the bootloader statute) and wait 360/720 hours.Go to the item "Unlocking via Mi Flash Unlock"!

Why unlock the bootloader

Below we will talk about at least 3 reasons why unlock the bootloader on Xiaomi smartphones. But the most important reason is that you are holding a Chinese phone with MIUI China ROM.

Custom and localized firmware

The first and main plus is the ability to install custom(unofficial) and localized(official, but with modifications specifically for your region) MIUI firmware. Some Xiaomi models accept third-party software, but in most cases, a locked Bootloader will not allow this. Now, in turn, let's consider what the custom firmware gives:

Richer functionality and advanced options that allow you to radically control the entire operation of the smartphone;
Installed root rights. Very often, unofficial firmware already has a "Superuser" mode in it.
Advanced and sensitive GPS navigator. The location is determined several times faster than in the standard version.
A highly optimized operating system kernel that either improves phone performance or extends battery life.

Modified Recovery (TWRP)

By unlocking the bootloader, you can easily or CWM-recovery, which is necessary not only to obtain root-rights, but also for other important operations on your smartphone. Let's take a closer look:

Gives access to the installation of new firmware;
Allows you to conduct easily and quickly, keeping and leaving absolutely all data intact;
Many small new options, changes and improvements to existing functions;
Allowing the installation of batch zip archives;
Improved touch interface.

Root rights

First, we need to download a special program Mi Flash Unlock(go to the branch of your model on the w3bsit3-dns.com forum, download from the link in the topic header, if you don’t find it, write in the comments, we will reset the link for you). In order to avoid getting a virus on the device, it is best to download the application from the official Xiaomi website. You can choose the version of the utility yourself, but, of course, the latest released update will be the highest quality and most effective (you can download a localized version of the program on w3bsit3-dns.com, that is, in Russian).

It is advisable to put the program folder in the root of the C drive, for example: C: \ MiFlashUnlock.

Step 1: launch Mi Flash

Now open the Mi Flash program as administrator, we see a white screen with text in Chinese (if the localized version is like mine, then in Russian), where the disclaimer rules are indicated. We agree and click on the appropriate button.

Step 2: login to Mi-account

We get into a new window that requires you to log into your Mi-account. Enter password and ID as they did in other situations. That is, so far there is nothing new, unusual and complicated. We carefully check the specified data and the keyboard layout, because it is at this stage that many users have problems with the appearance of such a notification: "You entered the wrong password and / or login." Click "Login".

Step 3: connecting your phone to your PC

Then we return to the smartphone itself. Turn it off and translate it into, simultaneously holding down the power key and volume down... With a USB cable.

Step 4: the unlocking process

The final final stage: the application begins to detect the smartphone and perform a lot of small necessary operations without our intervention. We are waiting for a few minutes ( in my case 25 seconds), and if everything was done correctly - we receive a notification about successful unlocking - three green dots... Ready!

Bootloader unlock error: retry after 72 hours

ATTENTION! In 99% of cases, you will not be able to unlock your smartphone, as you need to go through an additional check.

If you receive a message like: “ Binding time is too short, Less than 72 hours" or " After 360 hours of trying to unlock the device ", be aware - this is an additional verification of your account! That is, you must wait 3 days before repeating the procedure again. You won't be able to bypass the timer, be patient a little, I went through this and you will get through!

Important! At the time of this writing, Xiaomi decided to increase additional verification for such models as: Mi5X, Redmi Note 5A, Redmi 5A Redmi 5 / 5plus, Mi Max. They received unrealistic timer of 360 hours.

After you waited 72/360 hours, repeated the above procedure - got 3 green dots? Fine! The bootloader is unlocked. Now proceed to installing advanced recovery, that is, TWRP, about this in a separate article, in the category "Firmware".

Unofficial way to unlock (does not work)

The official way is the above option, but if for some reason you cannot wait for the application to be reviewed and approved, or if you need to unlock several devices at once, you should resort to little tricks. The success rate of this operation is 50 to 50%+ possible crashes and incorrect operation of the operating system. Still want to take the risk? Then let's get started.

Go to "Settings", go down to the very bottom and click "About phone". Now we click on the section about the MIUI version several times. As you already understood, this is necessary in order to enable developer mode. If you already have it active, we skip this item.
Now again we return to the root menu "Settings" - "Additional", "For developers".
We see the item "Mi Unlock State". A new tab opens, where we click "Add account or device".
Next, download a utility called "Mi Unlock", open it and unlock Bootloader with one click. If everything went well, we see in the status that the bootloader is unlocked.

Errors and problems

Most often, problems appear due to the server itself, in most cases there is no user fault. But, nevertheless, you need to know how to deal with them. We offer you an approximate list of violations and methods for their elimination for review:

The most common complaint is stop removing protection by 50%... It comes down to half and freezes. Unfortunately, these are site glitches, nothing can be done manually here. It remains only to periodically repeat the attempt. For about 2-3 times, everything should be successful.
Is not comingSMSto the specified number before sending the application... The fact is that all security codes are officially sent from China and periodically end for Russian numbers. You need to either turn on a VPN with a Chinese location, or try using a different phone number.
Green button is not active... Yes, this is a common problem during the application process. It is solved either by a normal browser restart, or by allowing the browser to display pop-up windows. Disabling an ad blocker sometimes helps.
Can't log in to yourMi-account... This is what we talked about above, and simply carelessness is to blame. Check which keyboard language is enabled, if you have entered the password correctly, and do not confuse your account ID with a phone number.
Is a SIM card required?
No, unlocking can be carried out without it, it does not matter.
As you can see, if you try, you can quickly and comfortably unlock the bootloader. The main thing is to follow the instructions and be very attentive to the entire process. Good luck!

Before flashing any Android device, some preparatory procedures are required. If we consider the issue of installing system software in devices manufactured by Xiaomi, in many cases it is necessary to unlock the bootloader. This is the first step towards success in flashing and getting the results you want.

Without delving into the reasons why Xiaomi began to block the bootloader in devices of its own production at a certain period of time, it should be noted that after unlocking it, the user gets a lot of opportunities to control the software part of his device. Among these advantages are getting root rights, installing custom recovery, localized and modified firmware, etc.

Before proceeding with the manipulations to unlock the bootloader, even in the official way authorized for use by the manufacturer, the following should be considered.

Responsibility for the results and consequences of operations carried out with the device is borne exclusively by its owner who carried out the procedures! The administration of the resource warns that the user carries out all actions with the device at his own peril and risk!

The Xiaomi manufacturer provides its smartphone and tablet users with an official way to unlock the bootloader, which will be discussed below. This requires only a few steps and is beneficial in almost all cases.

It is worth noting that unofficial methods of bypassing the blocking for many devices have been developed and widely spread by enthusiasts, including Xiaomi MiPad 2, Redmi Note 3 Pro, Redmi 4 Pro, Mi4s, Redmi 3/3 Pro, Redmi 3S / 3X, Mi Max.

The use of unofficial methods cannot be considered safe, since the use of such solutions, especially by inexperienced users, often leads to damage to the software part of the device and even "oskirping" the device.

If the user has already decided on a serious change in the software part of the device, released by Xiaomi, it is better to spend a little more time on unlocking by the official method and forget about this issue forever. Let's consider the unlock procedure step by step.

Step 1: Checking Bootloader Lock Status

Since Xiaomi smartphones are supplied to our country through various channels, including unofficial ones, it may well happen that unlocking the bootloader is not required, since this procedure has already been performed by the seller or the previous owner, in case of purchasing a used device.

There are several ways to check the lock status, each of which can be applied depending on the device model. A universal method can be considered the following instructions:

Download and unpack the package with and. In order not to bother the user with finding the necessary files and downloading unnecessary components, we suggest using the link:
Install the Fastboot-mode drivers by following the instructions from the article:

We put the device into Fastboot mode and connect it to the PC. All Xiaomi devices are switched to the desired mode by pressing the keys on the switched off device "Volume-" and while holding down the button "Turning on".

We hold both buttons until the image of a hare repairing Android and the inscription appears on the screen "FASTBOOT".

We start the Windows command line.

On the command line, enter the following:

Depending on the system response displayed on the command line, we determine the blocking status:

Step 2: Applying for unblocking

To carry out the procedure for unlocking the bootloader, you must first obtain permission from the manufacturer of the device. Xiaomi has tried to simplify the process of unlocking the bootloader for the user as much as possible, but you have to be patient. The application review procedure can take up to 10 days, although usually approval comes within 12 hours.

It should be noted that a Xiaomi device is not required to apply. Therefore, you can do everything to gain full control over the software part of the device in advance, for example, while waiting for the delivery of the device from the online store.

We register a Mi Account on the official Xiaomi website by following the steps from the instructions:
For filing an application, Xiaomi has provided a special page:
Follow the link and press the button "Unlock Now".

Log in to your Mi Account.
After checking the credentials, the unblocking application form opens "Unlock Your Mi Device".

Everything must be completed in English!
Enter the username and phone number in the appropriate fields. Before entering the digits of the phone number, select the country from the drop-down list.

The phone number must be real and valid! It will receive an SMS with a confirmation code, without which the application is impossible!
In field "Please state the real reason ..." you must add a description of the reason why you need to unlock the bootloader.

Here you can and should show your imagination. In general, a text like "Installing translated firmware" will do. Since all fields must be filled in English, we will use.

After filling in the name, number and reason, it remains to enter the captcha, set a mark in the checkbox "I confirm that I have read ..." and press the button "Apply Now".

We are waiting for an SMS with a confirmation code and enter it in a special field on the verification page that opens. After entering the numbers, press the button "Next".

Theoretically, a positive decision by Xiaomi, if possible, should be reported by SMS to the number indicated when submitting the application. It is worth noting that such SMS does not always come, even when receiving permission. To check the status, you should go to the website once every 24 hours.

Step 3: Working with Mi Unlock

As an official tool for unlocking the bootloader of its own devices, the manufacturer has developed a special Mi Unlock utility, the download of which becomes available after receiving approval for the operation from Xiaomi.

The utility does not require installation and to run it you just need to unpack the package obtained from the link above into a separate folder, and then double-click on the file miflash_unlock.exe.

Before proceeding directly to changing the bootloader status via Mi Unlock, it is important to prepare the device. We carry out the following step by step.
Upon completion of preparation, we reboot the device into the mode "Fastboot" and launch Mi Unlock without connecting the device to the PC yet.
Confirming risk awareness at the push of a button "Agree" in the warning window.

Enter the data of the Mi Account entered into the phone and press the button "Sign In".

We are waiting for the program to contact the Xiaomi servers and check for permission to perform the bootloader unlock operation.

After the appearance of a window telling about the absence of a device paired with a PC, we connect the device, which is switched to "Fastboot" to the USB port.

As soon as the device is detected in the program, press the button "Unlock"

and wait for the process to complete.

Everything happens quite quickly, the procedure cannot be interrupted!

Upon completion of the operation, a message about the success of the unlock is displayed. Push the button "Reboot" to reboot the machine.

Revert Xiaomi Bootloader Lock

If Xiaomi provides an effective tool in the form of the Mi Unlock utility for unlocking the bootloaders of its devices, then the reverse procedure does not imply an official way. In this case, locking the bootloader is possible with.

To return the bootloader status to the "locked" state, you need to install the official firmware version via MiFlash in the mode "Clean all and lock" according to the instructions from the article:

After such a firmware, the device will be completely cleared of all data and the bootloader will be locked, ie, at the output we get the device as “out of the box”, at least in software terms.

As you can see, unlocking the Xiaomi bootloader does not require any excessive efforts or special skills from the user. It is important to understand that the process can take quite a long time, and be patient. But after receiving a positive result, the owner of any Android device has all the possibilities to change the software part of the device for their purposes and needs.