How to install firmware on Xiaomi without unlocking the bootloader: 3 working ways

Installing custom or official firmware on Xiaomi smartphones has traditionally been associated with the need to unlock the bootloader, a procedure that requires waiting for permission from the manufacturer, linking a Mi Account and potential risks to the warranty. However, there are legal and semi-legal methods to circumvent this restriction, allowing you to upgrade or reflash the device without fully unlocking the bootloader.

In this article, we will discuss three proven ways to install firmware on Xiaomi, Redmi or POCO without unlocking the bootloader: through Fastboot with check-bypass, custom Recovery (TWRP) with a patch, and ADB-Each method has its own nuances, model limitations and risk levels, from relatively safe to potentially harmful to the device. It is important to understand that even without unlocking the bootloader, some actions can result in the device locking through anti-rollback or damage to the anti partition, so follow the instructions carefully.

Before you start, make sure your model supports the method you choose. For example, Qualcomm devices (such as the Redmi Note 10 Pro or POCO X3 Pro) are more likely to be bypassed than MediaTek devices (such as Redmi 9A), where protection is implemented more tightly. Also check the MIUI version - on older builds (before MIUI 12) the chances of success are higher.

1. Device Preparation: What to Do Before Firmware

Even without unlocking the bootloader, preparing the device remains a critical stage, and neglecting basic measures can lead to a "brick" or data loss.

• 📱 Create a backup through Settings → Additionally. → Backup or third-party utilities like Swift Backup. It's especially important to save application data, SMS Call logs – they may be lost.
• 🔋 Charge the battery to at least 70%. Fastboot or Recovery firmware can take up to 30 minutes, and discharging in the process is fraught with failures.
• 🔧 Install drivers for your model. Download Mi Flash Tool (for Fastboot) or ADB/Fastboot drivers from Xiaomi's official website. MediaTek devices may need to be used SP Flash Tool.
• 📂 Download the correct firmware. Only official Fastboot firmware (with.tgz extension) or customized ones will do the bypass of unlocking. ZIP Never use firmware from third-party sources without checking the hash amount (MD5).

Pay special attention to the firmware version. For example, if your device is running MIUI 13 and you are trying to install MIUI 12.5, the anti-rollback mechanism, which is rollback protection, is triggered, in which case the device will lock with the Anti Rollback Check Fail error. To avoid this, use only the firmware that is newer or the same version installed now.

⚠️ Note: On devices with a MediaTek chipset (e.g., Redmi) 9T, POCO M3) Trying to flash informal firmware without unlocking the bootloader in 90% of cases leads to hard-brick (complete failure). ADB sideload with official updates.

Before starting, check the status of the anti (antirollback) section with the command:

fastboot getvar anti

If you see an anti:3 or higher in the answer, it means that the device has strict protection, and bypassing unlocking may not be possible without official permission.

2. Method 1: Fastboot Firmware with verification bypass (for Qualcomm)

This method is suitable for devices on the Qualcomm Snapdragon platform (for example, for example, POCO F3, Redmi K40, Mi 10T) It allows you to install the official firmware without unlocking the bootloader. flash_all.bat, which skips the bootloader status check.

Algorithm of action:

1. Download the official Fastboot firmware for your model from MIUI Download. Unpack the.tgz archive into a folder.
2. Open the file. flash_all.bat in a text editor (for example, Notepad)++) and find a line:

fastboot % getvar product 2>&1 | findstr /r /c:"^product: %MATCHED_PRODUCT%" || echo MISMATCHED IMAGE & exit /B 1

1. Replace her with:

fastboot % getvar product 2>&1 | findstr /r /c:"^product: " || echo MISMATCHED IMAGE & exit /B 1

1. Save the file and run it. flash_all.bat The device must be in Fastboot mode (press Power). + Vol− off-phone).

If the process is successful, the device will restart with the new firmware, but there are risks:

• 🚨 Data loss – the method performs a complete reset (clean all).
• 🔒 Blocking Mi Account – Some devices may require data entry from the associated Mi Account after firmware is installed.
• ⚠️ Anti-rollback error – if the firmware is older than the current version.

⚠️ Note: On devices with Qualcomm Snapdragon 8xx (For example, Mi 11 Ultra, this method may not work due to additional protection. RPMB (In this case, the only way out is to officially unlock the memory block.

3. Method 2: Installation via custom Recovery (TWRP) with a patch

If you have already installed custom Recovery on your device (for example, TWRP), You can sew it up. ZIP-Firmware archive bypassing bootloader checks, which works on most models but requires pre-installing. TWRP, But there's a life hack, which in itself might require unlocking. TWRP You can install it temporarily through Fastboot without permanently recording the recovery section.

Instructions:

1. Download the temporary TWRP for your model (see the themes on XDA Developers or 4PDA marked "no-verity").
2. Download the device to Fastboot and execute the command:

fastboot boot twrp-3.6.2-no-verity.img

1. In temporary TWRP, go to Advanced → ADB Sideload and swipe through ZIP with firmware:

adb sideload miui_ROM.zip

1. After installation, run Wipe → Format Data (required!), otherwise the device will not boot.

The advantage of this method is the ability to install custom firmware (for example, LineageOS or Pixel Experience), but there are pitfalls:

For devices with MediaTek (such as the Redmi Note 8 Pro), instead of fastboot boot, use the SP Flash Tool with the Download Only option, but this requires separate instruction and increased caution.

Method 3: Local Upgrades via ADB Sideload

The safest method is to use the standard Recovery and ADB sideload command, which is suitable for installing official updates (for example, switching from MIUI 13 to MIUI 14) without unlocking the bootloader. The main condition is that the firmware must be a new version (not older than the current one) and is designed specifically for your model.

Step-by-step:

1. Download the full ZIP with the update (not Recovery ROM, but Update Package) from the official website.
2. Restart the device in Recovery (press Power + Vol+ when the phone is off).
3. Select Connect with MiAssistant (on newer versions of MIUI, this item may be called ADB Sideload).
4. Connect your phone to your PC and execute the command:

adb sideload miui_blockota_ROM.zip

It takes 5-15 minutes, and when it's done, it automatically restarts, and it doesn't reset data, it doesn't affect the status of the bootloader, but it has limitations.

• 🔄 Only official updates - custom ZIP unsupported.
• 📈 Only new versions – rollback on the old firmware will block the device.
• 🔌 Demands a worker USB-port – interruption of the connection will cause a failure.

⚠️ Note: On devices with Dynamic Partition (e.g. Redmi Note 11, POCO X5) The adb sideload command may not work due to the changed partition structure. TWRP.

1. Reinstall Google USB Driver drivers.

2. Use the original Xiaomi cable (cheap cables often do not support data transfer).

3. Launch. ADB on behalf of the administrator.-->

5. Frequent mistakes and how to avoid them

Even if you follow the instructions accurately, users are faced with errors, and let's look at the most common ways to solve them:

If after firmware, the device is stuck on the Mi logo (bootloop), follow the following steps:

1. Download to Fastboot (Power + Vol−).
2. Follow the cache reset command:

fastboot erase cache

1. If it doesn’t help, re-sweep the firmware with the clean all option.

On MediaTek devices, you may need a SP Flash Tool with a scatter file to recover from a crash, but this process is risky – a mistake in settings will result in a complete loss of IMEI.

💡

If after firmware, the device requires Mi Account binding, and you do not remember the data, use the official Mi Account Unlock Tool (requires confirmation via SMS to the associated number).

Xiaomi models that work (and don’t work)

The success of a firmware without unlocking the bootloader depends heavily on the device model, and below is a compatibility table for popular devices:

On devices with MediaTek (Redmi 9, POCO M3) The chances of successful firmware without unlocking are minimal because of the Secure Boot hardware protection — ADB sideload with official updates.

If your model is not in the table, check it on the XDA Developers or 4PDA forums for the "[Model] flash without unlock bootloader" type. Pay attention to the date of publication - current methods appear no more than 1-2 times a year.

7. Alternative methods: when nothing helps

If none of the methods described have worked, consider alternative options:

• 🔄 Official unlock - if the device is supported (unlock page) Waiting time - up to 720 hours (30 days).
• 🛠️ Service in the service center - some centers offer firmware without unlocking for an additional fee (from 1000 to 3000 rubles).
• 📦 EDL-mode - emergency loading mode, available through test points on the board. Requires boxing (UFi, EasyJTAG) and soldering skills.
• 🔧 Mi Flash Pro – the official utility for firmware in mode EDL, It requires an authorized Xiaomi account (available only to partners).

For devices released after 2022 (e.g., Redmi Note 12, POCO X5), bypassing unlocking the bootloader becomes almost impossible due to tightening of protection, in which case official unlocking remains the only legal way.

⚠️ Attention: Use EDL-Regimes without official access (through “gray” accounts) can lead to blocking IMEI or activation FRP (Factory Reset Protection: This will render the device unusable without chip-level repair.

FAQ: Answers to Frequent Questions