What is oem for android. How to unlock bootloader on Android smartphone. Official way. Installing another "operating system"

Experienced Android users often resort to unlocking the bootloader operating system to get root rights and install custom firmware. The platform developed by Google is quite logical, so there is a reason why devices come with locked bootloaders. Intervention in this area poses a security threat. By itself, the use of superuser rights can open up a lot of new opportunities and turn out to be an unequivocal benefit, but only if the owner of the device is aware of the risks and makes decisions based on understanding the principles of the operating system.

Hardware manufacturers don't care about bootloader locking because they want sole control over the system. As mentioned above, in this case, the issue of user safety plays an important role. Even the Google-designed Nexus line of smartphones targeted at tech-savvy people comes with a locked bootloader. Such devices load the operating system installed in this moment on them. The user will not be able to install a custom OS, as the bootloader will refuse to work with it.

Is there a way to unlock the bootloader? For users of devices such as the Nexus 4 or Nexus 7, there is a quick official method to achieve this goal. The only thing to consider is the fact that Android erases all data on the device as part of this process. It is necessary to activate the USB debugging option in the advanced settings for the developer, download the file “ Fastboot», Unpack it and load the smartphone in the appropriate mode. After connecting the device to the computer, you need to press the button " SHIFT"And at the same time the right mouse button, and from the menu that appears, select the option" open command window here"And enter the commands" fastboot devices" and " fastboot oem unlock". An open lock icon on the screen during the boot process indicates that the bootloader is unlocked. Each model has its own way to reset the bootloader lock.

The main problem is that the PIN or password protecting access to the Android device will lose all meaning, because unlocking the bootloader opens the way for people with physical access to the device to bypass the password request. An unlocked bootloader allows a thief to reboot a stolen device and load a custom recovery environment. In recovery mode using ADB commands you can access all data on your mobile device without asking for the set passwords.

A user who still resorted to unlocking his device, but needs protection, can use the encryption function on Android. This will ensure that the information is stored encrypted. The application “ WhisperCore". Encryption can be carried out using the tools built into the system, hidden in the settings, in the section “ Security».

Nevertheless, even this step will not be able to guarantee the inviolability of confidential information one hundred percent. There is a method to bypass the password request, theoretically associated with placing the phone in the freezer for an hour before flashing the new operating system on it. The principle of this hack is based on storing the encryption key in the device's RAM for much longer than RAM cools down so it can be removed before disappearing.

Of course, you shouldn't worry too much about the problems associated with the bootloader, because most often experienced users resort to the step described in the article for personal needs, and among the thieves there are rarely people who are aware of the methods of such hacking. Most likely, in the event of theft, all data will be simply erased to resell the device. Anyway, to block the bootloader there is good reason, especially if the smartphone is used to store government or corporate secrets.

Unlocking Bootloader (bootloader) on an Android phone or tablet is necessary if you needed to get root(except when you use programs like Kingo root), set or. This manual describes step by step the process of unlocking by official means, and not by third-party programs.

At the same time, you can unlock on most phones and tablets - Nexus 4, 5, 5x and 6p, Sony, Huawei, most HTC and others (except for unnamed Chinese devices and phones tied to the use of one telecom operator, this can be a problem) ...

Important information: When you unlock on Android, all your data will be deleted. Therefore, if they are not synced with cloud storage or saved on your computer, take care of it. Also, in case of incorrect actions and simply failures in the process of unlocking the bootloader, there is a possibility that your device will simply not turn on again - you take on these risks (as well as the possibility of losing the warranty - here from different manufacturers different conditions). Another important point - before starting, fully charge your device's battery .

Download Android SDK and USB driver to unlock Bootloader bootloader

The first step is to download the Android SDK developer tools from the official site. Go to the page http://developer.android.com/sdk/index.html and scroll through it to the section " Other download options».

In chapter SDK Tools Only download the option that suits you. I used a ZIP archive with the Android SDK for Windows, which I then unpacked to a folder on my computer's drive. There is also a simple installer for Windows.

From the folder with the Android SDK, run the SDK Manager file (if it does not start, the window just appears and then disappears, then additionally install Java from the official website java.com).

After launch, check the box Android SDK Platform-tools, the rest of the items are not needed (except perhaps the Google USB driver at the end of the list if you have a Nexus). Click the button Install Packages, and in the next window - “ Accept license»To download and install components. When the process is complete, close the Android SDK Manager.

In addition, you will need to download the USB driver for your Android device:

For Nexus, they are loaded using the SDK Manager as described above.
For Huawei, the driver is included in the utility HiSuite
For HTC - as part of HTC Sync Manager
For Sony Xperia, the driver is downloaded from the official page http://developer.sonymobile.com/downloads/drivers/fastboot-driver
LG - LG PC Suite
Solutions for other brands can be found on the respective official websites of the manufacturers.

Enabling USB Debugging

The next step is to enable USB debugging on Android. To do this, follow these steps:

Go to settings, scroll down - " About the phone».
Click on " Build number”Until you see a message stating that you have become a developer.
Go back to home page settings and open the item " For developers».
In chapter " Debugging"Turn on" USB debugging". If the OEM unlocking item is present in the developer options, then enable it too.

Get a code to unlock Bootloader (not needed for any Nexus)

For most phones other than Nexus (even if it is a Nexus from one of the manufacturers listed below), you need to get an unlock code to unlock the bootloader. This will help the official pages of manufacturers:

Sony Xperia - http://developer.sonymobile.com/unlockbootloader/unlock-yourboot-loader/
HTC - http://www.htcdev.com/bootloader
Huawei - https://emui.huawei.com/en/plugin.php?id=unlock&mod=detail

These pages describe the unlocking process, and it is also possible to obtain an unlock code by device ID. This code will be required later.

I will not explain the whole process, since it differs for different brands and is explained in detail on the corresponding pages (albeit in English), I will only touch upon obtaining Device ID.

For Sony Xperia phones, the unlock code will be available on the above site according to your IMEI.
For Huawei phones and tablets, the code is also obtained after registering and entering the required data (including the Product ID, which can be obtained using the phone keypad code that will prompt you) on the previously indicated website.

But for HTC and LG, the process is somewhat different. To obtain an unlock code, you will need to provide a Device ID, I describe how to get it:

Turn off Android device(completely by holding down the power button, not just the screen)
Press and hold the buttons power + sound down until the fastboot boot screen appears. For HTC phones you will need to select fastboot volume buttons and confirm the selection by short pressing the power button.
Connect your phone or tablet via USB to your computer.
Go to the folder Android SDK - Platform-tools then holding ShiftOpen command window».
At the command prompt, enter fastboot oem device-id(on LG) or fastboot oem get_identifier_token (for HTC) and press Enter.
You will see a long numeric code spread over several lines. This is the Device ID that you need to enter on the official website to get the unlock code. For LG, only the unlock file is sent.

Note:bin files that will come to you by mail are best placed in the Platform-tools folder so as not to specify the full path to them when executing commands.

Unlock Bootloader

If you are already in fastboot mode (as described above for HTC and LG), then the next few steps are not required until you enter the commands. In other cases, we enter Fastboot mode:

Turn off your phone or tablet (completely).
Press and hold the buttons power + volume down until the phone boots into Fastboot mode.
Connect your device via USB to your computer.
Go to the folder Android SDK - Platform-tools then holding Shift, click in this folder with the right mouse button (in a free space) and select the item " Open command window».

fastboot flashing unlock - for Nexus 5x and 6p
fastboot oem unlock - for other Nexus (older)
fastboot oem unlock unlock_code unlock_code.bin- for HTC (where unlock_code.bin- the file you received from them by mail).
fastboot flash unlock unlock.bin- for LG (where unlock.bin- the unlock file that was sent to you).
For Sony Xperia, the command to unlock the bootloader will be listed on the official website when you go through the whole process with choosing a model, etc.

Articles and Life Hacks

The concepts of blocking and unblocking are often difficult for those users who have encountered them for the first time. Let's talk about what does "phone unlocked" mean, and also briefly tell you how you can unlock it yourself. To do this, it is quite possible that you have to figure it out, since in some cases it may be necessary.

What does "unlocked phone" mean? How to check if the device is unlocked?

The concept of blocking a mobile device can mean that a special power-on password is set on it. However, most often it is meant to be tied to a specific telecom operator. In other words, the phone can only work with a SIM-card of any operator. Usually we are talking about the iPhone from the United States. If it is imported into the Russian Federation through official channels, the device is most likely unlocked. The problem of blocking is faced by those who become the owners of "gray" phones (most often they only work with the AT&T operator).

To check if your iPhone is unlocked, you first need to find out your IMEI number. You can find this identifier in the "About device" item ("Settings"> "General"), or by dialing the combination * # 06 #.

Having found it out, you should use the IMEI.info service. In the line "Enter IMEI" enter the identifier. We press the check button ("Check") and we see various data about the phone. The next step: click "Free simlock status check", after which the site should check the iPhone linking against the database. If the device is unlocked, "Unlocked" should be displayed. The IMEI.info service is free and you can use it without a credit card. If necessary, we create an account in advance.

The next verification method is even simpler. This requires a second SIM card. Disconnect iPhone. Using a special paper clip, remove the SIM card, and then install the SIM card of another mobile operator. We turn on the device and try to make a call to another subscriber. If we succeed, the device is unlocked. At the same time, we can hear a message that we cannot call.
So, we figured out what it means: the phone is unlocked. Now let's talk about how you can unlock it yourself.

How do I unlock my phone?

Unfortunately in recent times the number of so-called "experts" who are ready to help with unlocking a mobile device for a small amount has increased. It is recommended that you contact only trusted specialists, otherwise it is highly likely that the iPhone will later cause some trouble. And in the end it will turn out to be impossible, as well as for its intended purpose.

There is a possibility of buying an unlock online - for example, through Ebay. The main thing is to find a seller about whom there are many positive reviews. You will also need to pre-register on Ebay, and preferably - registration in payment system PayPal (its use will protect against unscrupulous sellers). When working with PayPal, a link to a bank card is used.
In the notes when buying on Ebay, we indicate our IMEI identifier.

If the seller has already unlocked the mobile device, you need to turn it off and install a SIM card from another operator (which did not work before).

After that, you should connect the iPhone to the computer, launch iTunes and wait until the program reads the phone. Then wait another 10 seconds and reconnect the iPhone. ITunes should display a successful activation notification.

A jailbreak will also help, but it is done at your own peril and risk. It is possible that after it is held, we will end up with a "brick".

Bootloader- This is the part of the Android OS that is responsible for the normal loading of the operating system. In most cases, it acts as a guarantee that the device will run official firmware from the manufacturer. When it comes to installing custom recovery, kernel or whole firmware, the bootloader blocks this possibility.

The AndroGoo website has prepared an instruction with which you can easily and quickly unlock the Huawei bootloader and start customizing your device.

Unlock Bootloader Huawei

First, we need to get the code to unlock the bootloader:

Go to Huawei official website ... Do not be intimidated by the Chinese language, the main thing is to follow the instructions.
Go to the "Downloads" section.

We select the item "Unlocking the bootloader".

We confirm the transition.

We select the item "Registration".

We register through the mailbox.

We enter all the necessary data and confirm them. After completing point 2 (in the picture), we have a minute for everything about everything.

After registration, we will be redirected to the "Downloads" page, where we again click the "Unlock the bootloader" item and confirm the transition.

We get to the page for accepting the agreement. We accept it.

We get to the data entry page.

Checking your ID.

Huawei unlock code received!

We start unlocking the bootloader after receiving the code

After unlocking the bootloader ALL USED DATA WILL BE DELETED! Save all important information!

Turn on the mode in the phone "For developers"- for this in Settings — About the phone click on "Build number";
Then in the section "Settings" — "For developers" turn on "USB debugging", and "Allow Factory (OEM) Unlock"(relevant for owners of phones with international ( non-Chinese) firmware version EMUI 4.1 and higher).
Install.
Turn off the phone, hold down the key volume"-" and connect the phone to the PC via the cord. The smartphone will boot into the mode FASTBOOT, the driver installation on the PC starts.
Downloading the archive ADB + FASTBOOT and unpack it wherever you like.
Hold down the key SHIFT, press the right mouse button on the folder ADB + FASTBOOT, choose - "Open command window", will open windows command line.
Now in the command line, to check that the connection to the computer is established normally, type the command fastboot devices, - the serial number of the phone should be displayed. If not, we don't go further according to the instructions, there is a problem with the drivers (there is no connection between the PC and the phone).
To check the status of the bootloader, enter the command fastboot oem get-bootinfo. WITH the status will be either LOCKED or UNLOCKED(locked, unlocked). If the status LOCKED- we go further according to the instructions, if UNLOCKED- then we skip this section.
Next, enter the command fastboot oem unlock ****************, where the asterisks are the 16-digit code you received to unlock the bootloader.
A warning window will pop up on the phone screen and at the bottom there are two options. Push volume + choose Yes Unlock bootloader, press the power button.
Then the phone will reboot itself and the phone will be reset, all data will be lost.
Bootloader Huawei unlocked!

If you can't get the unlock code

One more moment was discovered from personal experiments, observations and study of forums - if you often request a code from your phone with your serial on the site, for example, you enter the wrong phone model, then the serial is entered into the database with a ban! Presumably, if you entered your serial number 5 (maybe 3) times in the serial number field and each time you received an error, then your serial number is entered into the so-called base banned for "14 days"... Those. if you used the old instructions from other sections, where the site looks different, then one field was incorrect at once (model input field), and therefore the data required for unlock is not correct (although for unlock only the serial number is needed - calculated with probability in 99%, everything else is purely to confirm that this is exactly the same code).

Here a moment arises - they ask it is not clear what to do for at least 14 days. This means the following - log in with account(with which you plan to unlock the boot) on the phone in the Huawei Cloud app and be online for at least 14 days, i.e. constantly appear on the network and send some data about your phone, for example, that you do not have root rights (one of the basic requirements). After the data has been processed, you will be given the go-ahead to receive the unlock code on the site.

There is also an opinion that having logged in through Facebook, it is possible to receive a code in case of impossibility after direct registration on the site!

If you have Chinese firmware initially, you are automatically in the "14 days" database.

If you often asked for a code according to the old instructions, or entered the data incorrectly, but at the same time your serial number was in the request form, you will be subject to the fate of “14 days”.

Error writing options:

On the English version of the site The Huawei ID used to apply for the unlock code has not been used on the device for more than 14 days.
On the Chinese version of the site 用于申请解锁码的华为云帐号未在本手机上登录超过 14 天！

During the operation of the smartphone, it is not enough for some users to be content with what the manufacturer of the mobile device provides. How to find out if the bootloader on Xiaomi is unlocked, which is necessary to install all kinds of firmware?

First of all, you should pay attention to the fact that the firmware has various modifications and branches from global to "self-made". If you want to know more about them, you should read the article:

How to know if Xiaomi bootloader is locked?

When you turn on the phone
If, when you turn on the smartphone, a lock icon appears with the inscription “bootloader unlock” (“unlock bootloader” or simply “unlock”), then this means that the mobile device is unlocked and ready for experiments.

During firmware
It can also be noticed when trying to flash a smartphone using Xiaomi apps Mi Flash. The program will give an error and inform you that the bootloader is locked.

In system settings
In addition to the above methods, you can find out about the status of the bootloader from the settings menu. To do this, go to the settings themselves and in the "System and Device" section click on the "Advanced" button and look for the "For Developers" item.

In the window that opens, there is a line "Bootloader status" in which the current state of the Bootloader is indicated.

Why Unlock Xiaomi Bootloader?

The bootloader (or Bootloader) is a built-in tool on any smartphone that is responsible for loading the operating system. As a rule, the bootloader is locked by the manufacturer so that unauthorized persons cannot interfere with the operation of the device, but if desired, it can be unlocked and then such a phone can be safely flashed to unofficial firmware that are suitable for it, as well as install various patches, make full backups, etc. ...

How to Unlock Bootloader Xiaomi Mi5?

This instruction is suitable for unlocking Bootloader MI5 and other Xiaomi smartphones.

First, we register a Mi account, if you do not have one yet.

After that, download the Mi Flash Unlock application, unpack it, launch it and agree to the terms.

The system reports that the phone is not connected.

The switched off smartphone is connected with a cable to the computer (laptop), after which we simultaneously press the volume key up and the power button. The smartphone will enter FastBoot mode.

After connecting the smartphone, the Mi Flash Unlock program will detect it and the unlock button will become active.