Unlocking the Xiaomi Redmi 4A bootloader: expert guide

The process of obtaining superuser rights and installing custom firmware on budget devices of the Redmi line often begins with overcoming the software limitations of the manufacturer. Xiaomi Redmi 4A, despite its age, remains a popular platform for experimentation due to the availability of spare parts and the active support of the development community. However, before proceeding with the modification of the system, you need to remove the lock from the bootloader, which is closed by default by MIUI.

Opening a bootloader is a critical step that gives you full control over the device’s file system, but also deprives the user of some of the warranty obligations and built-in data protection. In this article, we will discuss in detail the official unlock method that requires linking an account, and discuss the technical nuances specific to the model with a Snapdragon 425 processor.

To successfully perform the operation, you will need a stable Internet connection, original or quality certified. USB-Do not rely on wireless methods or third-party utilities of dubious origin, as they may contain malicious code or work incorrectly with Qualcomm drivers. Below is a step-by-step instruction, tested in practice.

Preparation of the device and account Mi

The first step is to properly configure the smartphone itself, because without fulfilling certain conditions, the authorization servers will not issue permission to unlock. SIM-card with active mobile Internet, as the link is by phone number, not just by Wi-Fi connection. Go to the settings and make sure that the device is authorized your personal Mi Account, which will be used to log into the unlock utility on your PC.

Then activate the hidden menu for developers. To do this, go to Settings → About Phone and quickly click 7-10 times in a row on the MIUI Version field until you notice that you have become a developer. Then a new option will appear on the menu “Additional” or “Extended settings”, where you need to find the “Developers” section.

⚠️ Attention: Including debugging by USB makes the device visible to the computer in diagnostic mode, which potentially reduces the level of security of personal data when connecting to someone else's PC.

Within the developer menu, you need to activate two key parameters: USB debugging and Mi Unlock status. When you turn on the second item, the system will require re-authorization in the Mi Account and warn about the risks, and this is where the device is initially associated with the account, after which the waiting time countdown should start.

Installation of drivers and utilities Mi Unlock

The Windows 10/11 operating system often automatically installs the basic ADB drivers, but Fastboot mode requires specific files from Qualcomm or Xiaomi. It is recommended to download and install the Mi USB Driver package from the official developer site to avoid device signature conflicts in the Task Manager.

The next step is to download the official Mi Unlock Tool, which is the only program that has the right to send a command to the Xiaomi server to check the resolution status. Download it exclusively from the en.miui.com domain, as third-party builds can be modified by attackers. Once downloaded, unpack the archive into a separate folder on the system disk, preferably in the root, so that the path does not contain Cyrillic characters.

Run the executable file miflash_unlock.exe On the first run, the program will require authorization — enter the same Mi Account information as on the phone. If done correctly, the utility interface will be ready to work, and the connection status will be displayed at the bottom of the window. In case of login errors, check the correctness of the password and the presence of an antivirus that can block the network activity of the program.

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Use it. USB-port 2.0 (black) on the back of the motherboard, as ports 3.0 (blue) on older motherboards sometimes cause problems with connection stability when running the firmware.

The binding process and waiting for permission

The most difficult psychological stage for many users is the waiting period: once the Factory Unlock feature is turned on on on the smartphone, the system sends a request to the server. Depending on the region and Xiaomi policy at the time of registration, the timer can show the need to wait from 72 hours (3 days) to 168 hours (7 days) or even 30 days for new accounts.

It's important to understand that this timer is tied to a unique device and account identifier. Trying to reset your phone or reinstall the app while you're waiting will reset the timer and make you start the binding procedure again. So after you tick the developer menu, just use your phone as normal, without interfering with your system settings.

After this time, the status in the "Factory Unlock" menu will change, and the "Unlock" button will appear, but you do not need to press it on the phone itself, this action is performed only through the computer, make sure that enough time has passed since the feature was turned on, and proceed to the final stage.

Step-by-step instructions for unlocking

When the wait period has expired, you can start directly unlocking. To do this, completely turn off the Redmi 4A smartphone. Then press the volume and power down buttons at the same time. Hold them until the image of a hare repairing an android appears on the screen, or the inscription FASTBOOT. This is a special boot mode that allows you to perform low-level operations.

Connect your phone to your computer. In the Mi Unlock Tool, press the Unlock button. The program will warn you that all data on your device will be destroyed, an inevitable process of formatting the userdata partition for security purposes. Confirm the action and the process of exchanging data with the server begins.

The progress bar will go through several stages: checking your account, checking your device, sending an unlock command. The entire process takes from 10 seconds to several minutes. If successful, the message will appear "Unlocked successfully", and the phone will automatically restart. The first boot after unlocking can last up to 5-10 minutes, as the system creates new encryption keys.

Common mistakes and ways to solve them

When you unlock, you often encounter error codes that are confusing, and one of the most common is the error, "Couldn't verify device" or "Current account is different," which means that the utility on the PC and the phone settings used different Mi Account accounts, and the solution is simple: log out of all the accounts on the phone, leave only the one you need, re-link the device and try again.

Another common problem is a 99 percent freeze or network error, which could be due to a Xiaomi server lock by a provider or an antivirus. VPN European IP-address or give the Internet from the phone, changing DNS 8.8.8.8 also helps to use the USB-hub without external power supply or, conversely, connecting directly to the motherboard port.

⚠️ Note: If the utility gives an error that "Too many attempts", do not try to repeat the procedure immediately.

In rare cases, there is an error related to the Android version. Since Redmi 4A is an old device, some new versions of the Mi Unlock Tool may not work properly with it, in such a situation, it makes sense to try an older, proven version of the utility (for example, version 3.x or 4.x), which can be found in the archives of profile forums.

Questions and Answers (FAQ)

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Unlocking the bootloader is an irreversible action in terms of data loss, but reversible in terms of returning to stock firmware, so always have a backup at hand.

The final step after successful unlocking is to check the status. Go back to the developer menu and make sure the status has changed to Unlocked. Now your device is ready to install the custom TWRP recap and then flash it back. Remember, with an open bootloader, you are fully responsible for the stability of the system and the security of your data.