Updating firmware on Android often brings new features, security fixes, and improved performance. But what to do if, after the upgrade, the phone began to slow down, discharged in a few hours, or completely stopped supporting your favorite applications? Firmware rollback is a procedure for returning to the previous version of the operating system, which can restore stability to the device. However, this process is fraught with risks: from data loss to complete “bricking” of the gadget if something goes wrong.

In this article we will look at all current methods of firmware rollback from official methods through Recovery Mode to manual flashing through Fastboot and specialized utilities like Odín for Samsung or Mi Flash Tool for Xiaomi. You will learn how to prepare your phone, where to find the correct firmware version, and what to do if the device does not turn on after a rollback. And also - which Android 14+ models block rollback software, and how to bypass this without losing the warranty.

Why might you need to roll back the firmware?

The reasons for returning to the old version of Android are varied, but most often users encounter the following problems:

  • 🐢 Critical drop in performance —the new firmware “slows down” even on flagships, applications take a long time to open, animations are jerky.
  • 🔋 Increased battery consumption —the battery runs out in 3–4 hours instead of the usual 12–16, even in standby mode.
  • 🚫 Incompatibility with applications —banking apps, games or corporate software stop working due to changes in the API.
  • 🔊 Problems with hardware —after the update, the speakers, camera, sensor stopped working fingerprints or a 5G module.
  • 🔒 Imposed restrictions —the manufacturer has blocked bootloader unlocking, removed root access or limited functionality (for example, removed microSD support).

Sometimes a rollback is required for less obvious reasons. For example, if the firmware is new removed hidden functions (like Developer Options on some OnePlus) or if you are participating in beta testing and want to return to the stable version. It is important to understand that not all problems can be solved by a rollback - sometimes it is not the software that is to blame, but hardware faults (for example, a swollen battery or a damaged motherboard).

⚠️ Attention: On devices with Android 12+ and newer versions, rollback may be blocked at the bootloader level due to functions Rollback Protection. Trying to flash the old version will result in an error ERROR: anti-rollback check fail.
📊 What problem did you encounter after the update?
The phone began to slow down
The battery is draining quickly
Stopped working applications
The hardware is broken (camera, speakers, etc.)
Another problem

Preparing the phone for a firmware rollback

Before starting the procedure, be sure to follow these steps they minimize the risks of data loss and device damage:

  1. Create a backup all important data. Use Google Drive, Titanium Backup (for root users) or Swift Backup. Please note: after a rollback, some backups (for example, SMS or calls) may not be restored.
  2. Check the model and bootloader version. Go to Settings → About phone and write down:
    • Device model (for example, SM-G991B for Samsung Galaxy S21).
    • Current Android version and build number (for example, TP1A.220624.014).
    • Bootloader version (Bootloader Version), if specified.
  • Charge your phone to at least 70% — the rollback process can take from 10 minutes to an hour, and draining the battery during the firmware will lead to a “brick.”
  • Download the correct firmwareUse official sources:

    Pay special attention firmware versionsIt should be:

    • 📱 Compatible with your model (firmware for Galaxy S22 is not suitable for Galaxy S22+).
    • 🔙 Older than the current one (you cannot flash a version newer than the one that is already installed, without a full reset).
    • 🌍 For your region (for example, firmware for EUR may not work on a phone with a region RU).

    ☑️ Checklist before rolling back the firmware

    Done: 0 / 5

    Methods for rolling back firmware: which one to choose?

    The choice of method depends on phone model, current version of Android i access to tools. Below is a comparative table of all current methods:

    Method Suitable for Requires bootloader unlocking? Risk of data loss Difficulty
    Through Recovery Mode (official rollback) Samsung, Xiaomi, some Motorola ❌ No ⚠️ Partial (settings will be reset) ⭐⭐ (simple)
    Fastboot (manual firmware) Google Pixel, OnePlus, Nokia, most A-brands ✅ Yes ⚠️⚠️ Full reset ⭐⭐⭐ (average)
    Odín (for Samsung) All models Samsung (except new ones with Knox 3.0+) ❌ No (but it works Knox) ⚠️⚠️ Full reset ⭐⭐⭐ (average)
    Mi Flash Tool (for Xiaomi) All models Xiaomi/Redmi/POCO ✅ Yes (except for Chinese versions) ⚠️⚠️⚠️ Full reset + account blocking possible ⭐⭐⭐⭐ (difficult)
    Custom recovery (TWRP) Any devices with an unlocked bootloader ✅ Yes ⚠️ Partial (you can choose what to save) ⭐⭐⭐⭐⭐ (difficult)

    If your phone Does not support official rollback (for example, Google Pixel s Android 14+), the only option is manual firmware via Fastboot or custom recovery. But be aware: this will result in Full data reset and may void your warranty.

    💡

    Before choosing a method, check to see if your manufacturer blocks rollback. For example, Huawei and Honor after 2019 often use Anti-Rollback> protection, and Samsung activates the Knoxflag, which voids the warranty.

    Rolling back firmware via Recovery Mode (the safest method)

    This method is suitable for devices where the manufacturer has provided the ability to rollback out of the box. Most often it works on Samsung, Xiaomi and some models Motorola. The main advantage is no bootloader unlocking required and the risk of "brick" is minimal.

    Instructions:

    1. Turn off the phone.
    2. Hold down the button combination to enter in Recovery Mode:
      • For Samsung: Power + Volume Up + Bixby (or Power + Volume Up on new models).
      • For Xiaomi: Power + Volume Up.
      • For Motorola: Power + Volume Down (then select Recovery in the menu).
  • In the recovery menu, select Apply update from ADB (if available) or Install update from SD card.
  • Connect the phone to the PC and download the firmware via the command: 
    adb sideload filename.zip

    Or select the firmware file from the memory card if you downloaded it in advance.

  • Wait for the process to complete (usually 5-15 minutes).
  • Reboot the phone via Reboot system now.

    • If there is no option in the recovery menu to install updates, it means that your manufacturer has blocked this method. In this case, you will have to use Fastboot or specialized utilities.

    ⚠️ Attention: On some devices Samsung after a rollback via recovery, the Knox flag may work (check in Download Mode). This will lead to loss of warranty and inability to use Samsung Pay or Secure Folder.
    What to do if recovery does not see the firmware?

    If the firmware file is not detected, check its integrity (MD5 hash), rename it to update.zip and place it in the root of the memory card. Some Xiaomi require a signed file with the extension .tgz.

    Rollback via Fastboot (universal method for most Androids)

    This method is suitable for devices with an unlocked bootloader, including Google Pixel, OnePlus, Nokia and many others. It requires installing ADB/Fastboot drivers on a PC and basic command line knowledge. The main disadvantage is full data reset (factory reset).

    Step-by-step guide:

    1. Unlock the bootloader (if not unlocked): 
      fastboot flashing unlock

      On phone, confirm the unlocking (this will erase all data!).

    2. Download factory image for your model from the official website (for example, for Pixel from Google page).
    3. Unpack the archive from firmware to the folder with fastboot.
    4. Connect the phone to the PC in Fastboot Mode (hold Power + Volume Down when turning on).
    5. Run the file flash-all.bat (for Windows) or flash-all.sh (for Linux/Mac).
    6. Wait for completion (the process may take up to 30 minutes).

    For devices without ready-made scripts (for example, Xiaomi), you will have to flash each partition manually:

    fastboot flash boot boot.img

    fastboot flash system system.img
    

    fastboot flash vendor vendor.img
    

    fastboot flash dtbo dtbo.img
    

    fastboot reboot

    After rebooting, the phone will be in the “as after purchase” state. If the firmware is not suitable, you will see an error FAILED (remote: 'Not allowed in Lock State') —this means that the bootloader is locked.

    ⚠️ Attention: On devices with Android 13+ i Dynamic Partition (for example, Pixel 6/7), manual firmware can lead to error Invalid sparse file format at header. In this case, use the full one factory image from the official website.
    💡

    If after flashing the firmware via Fastboot the phone is stuck on the logo, try resetting the cache via recovery (Wipe Cache Partition).

    Rolling back the firmware on Samsung via Odín

    For devices Samsung (except for new models with One UI 6+) there is a semi-official utility OdínIt allows you to flash full firmware (with extension .tar.md5) without unlocking. bootloader, but with the risk of triggering Knox.

    Instructions:

    1. Download Odín (version 3.14.4 or later) and firmware in format .tar.md5 for your model.
    2. Turn off the phone and transfer to Download Mode (press Volume Down + Volume Up, then connect the USB cable).
    3. Run Odín, connect the phone (the log should show appear Added!).
    4. In the section Options uncheck the Auto Reboot (this will help avoid getting stuck on the logo).
    5. Add firmware files to the appropriate fields:
      • BL — bootloader (bootloader).
      • AP — main firmware.
      • CP — modem.
      • CSC — region (select HOME_CSCto save the data, but this does not always work).
  • Click Start and wait for completion (logs PASS! in the upper left corner).
  • After flashing manually put the phone into recovery (press Power + Volume Up) and do Wipe Cache Partition.

    • If after the firmware the phone is stuck on the logo Samsung, try:

    • 🔄 Reflash with a checkmark Auto Reboot.
    • 📱 Flash the file separately CSC (do not HOME_CSC).
    • 🔧 Use the patch Disable_Dm-Verity_ForceEncrypt (for old models).
    💡

    On new ones Samsung Galaxy S23/24 and Fold 5 rollback via Odín can block access to Samsung Knox and services like Samsung HealthCheck the Knox status in Download Mode (should be Knox Warranty Void: 0x0).

    Rollback firmware for Xiaomi (Mi Flash Tool and more)

    Device Xiaomi, Redmi and POCO require a special approach due to protection Anti-Rollback and account linking Mi AccountThere are two here. option:

    Method 1: Via Mi Flash Tool (full reset)

    1. Unlock the bootloader via official Xiaomi tool (account linking required).
    2. Download Mi Flash Tool and the firmware in format .tgz for your model.
    3. Turn off the phone and switch to Fastboot Mode (Power + Volume Down).
    4. B Mi Flash Tool select the downloaded firmware and press Refresh (the device should appear).
    5. Select mode Clean All (full reset) or Clean All and Lock (reset + bootloader lock).
    6. Click Flash and wait for completion (10-20 minutes).

    Method 2: Via TWRP (saving data)

    If you have custom recovery installed TWRP, you can try to roll back the firmware without a full reset:

    1. Download the firmware in format .zip (for example, from Xiaomi Firmware Updater).
    2. Move the phone to TWRP Recovery (Power + Volume Up).
    3. Make a backup of the current firmware (Backup → Select Partitions → Swipe to Backup).
    4. Install the downloaded .zip file via Install.
    5. Wipe the cache (Wipe → Dalvik / ART Cache + Cache).
    6. Reboot.
    ⚠️ Attention: On devices with MIUI 14+ and Dynamic Partition (for example, Xiaomi 13/14, Redmi Note 12) rollback via TWRP can lead to an error E:unknown command [log]. In this case, use only Mi Flash Tool.

    What to do if the phone does not turn on after a rollback?

    If after trying to rollback the device does not respond to buttons, hangs on the logo or goes into bootloop (cyclic reboot), try the following steps:

    1. Hard reset via recovery

    Press the combination to enter recovery (usually Power + Volume Up) and select:

    • Wipe data/factory reset — full reset.
    • Wipe cache partition — clear cache.

    If recovery is not available, try flashing it via Fastboot:

    fastboot flash recovery twrp.img

    fastboot reboot recovery

    2. Firmware via EDL (emergency mode)

    If the phone does not respond at all (even to Fastboot), the bootloader may be damaged. In this case, firmware via EDL Mode (Emergency Download Mode):

    • For Xiaomiwill help: use Mi Flash Tool with the option Clean All and Lock.
    • For Qualcomm chips: use the utility QFil or QPST.
    • For Samsung: try flashing through Odín with a checkmark Nand Erase All.

    3. Contacting the service center

    If none of the methods helped, it may be damaged eMMC memory or power controller. In such cases, it is necessary soldering or to replace the chip, which is only possible at a service center. The cost of repair depends on the model:

    • 📱 Budget phones (up to 20,000 ₽) - 3,000–8,000 ₽.
    • 📱 Flagships (from 50,000 ₽) - 10,000–25,000 ₽.
    ⚠️ Attention: If your phone is under warranty, do not try to repair it yourself after an unsuccessful rollback Manufacturers (especially Samsung and Apple) may refuse warranty service if they find traces of tampering with the firmware.

    FAQ: Frequently asked questions about firmware rollback

    Is it possible to roll back the firmware without losing data?

    On most devices No - rolling back leads to a complete reset. Exceptions: No format

    • Some firmware for Xiaomi (if you choose HOME_CSC V Odín).
    • Rollback via TWRP (if not formatted /data).

    But even in these cases glitches are possible, so backup is required.

    How do I know if my phone is blocking rollback?

    Check:

    • On Samsung: in Download Mode look at the line RP SWREV. If the value is higher than in the old firmware, rollback is blocked.
    • On Xiaomi: if there is ARB (Anti-Rollback), rollback is impossible.
    • On Google Pixel: all devices with Android 12+ block rollback programmatically.
    What is Knox and why does it work after rollback to Samsung?

    Knox is a security system Samsungthat monitors the integrity of the firmware. Any intervention (including rollback) triggers the flag Knox Warranty Void: 0x1, which means:

    • Loss of warranty.
    • Inability to use Samsung Pay, Secure Folder, Knox Workspace.
    • Problems with OTA updates.

    Return Knox 0x0 impossible is hardware protection.

    Is it possible to roll back the firmware on a phone with a locked bootloader?

    Depends on the manufacturer:

    • ✅ You can on Samsung (via Odín), LG (via LGUP), some Motorola.
    • ❌ Cannot on Google Pixel, OnePlus, Xiaomi (required unlocking).

    On devices with Android 13+ even an unlocked bootloader does not guarantee a successful rollback due to Rollback Protection.

    How to regain root access after a rollback?

    After a rollback root access is lost. To get them back:

    1. Unlock the bootloader (if it is locked).
    2. Flash custom recovery (TWRP or OrangeFox).
    3. Install Magisk via recovery or patch boot.img.

    On new devices (for example, Samsung Galaxy S23) a bypass may be required RMM State or KG State.