Downloading the operating system on a smartphone is a procedure that requires care and technical training. Many users are faced with the need return to the old version of Android after updating: new builds can be slow on weak devices, contain critical bugs or remove familiar functions. For example, owners Samsung Galaxy S21 after upgrading to Android 14 complained about problems with camera autofocus, and Xiaomi Redmi Note 10 - about increased power consumption.

However, downgrading is not such a simple task as installing the update. Manufacturers deliberately make the rollback process more difficult to avoid ecosystem fragmentation and security issues. In some cases (for example, on Google Pixel 7 s Android 15) it is generally impossible to return the old firmware without losing data or risking the device being “bricked”. This article will help you assess the risks, prepare for the procedure and complete it with minimal losses.

⚠️ Warning: Downgrading Android can lead to loss of warranty, blocking of the device or inoperability of certain functions (for example, SafetyNet for banking applications). On some models (for example Sony Xperia with a locked bootloader), a rollback is impossible without official software from the manufacturer.

📊 Why do you want to roll back Android?
The new version is slow
Necessary functions have disappeared
Bugs and errors have appeared
Experiment/curiosity
Another reason

1. Preparing for a downgrade: what you need to do before you start

Before you begin the rollback, there are several critical steps you need to take. Without data backup you risk losing photos, contacts and messages - most downgrade methods require a full reset (factory reset). Also check if your model supports rollback: on some devices (for example Huawei c EMUI 12+it is officially prohibited.

First, determine the current and target versions of Android. To do this, go to Settings → About phone → Android version. Write down the exact name of the assembly (for example, RP1A.201005.004.A1 for Pixel 6). Then find a compatible firmware on official resources:

  • 🔗 Google Pixel: Official archive factory-images (requires unlocked bootloader)
  • 🔗 Samsung: Service Frija or SamFirm to download firmware by model and region (CSC)
  • 🔗 Xiaomi: Mi Flash Tool + firmware from official website (select Fastboot versions)
  • 🔗 Other brands: Look for firmware on the forums XDA Developers or 4PDA, but check user reviews!

Pay attention to bootloader version (bootloader). On many devices (for example OnePlus 9 Pro), you cannot flash old firmware if the bootloader is newer than a certain version. Check it in the mode Fastboot with the command: 

fastboot getvar all

Found out the current version of Android and builds|Downloaded the official firmware for your model|Created a backup copy of the data (photos, contacts, SMS)|Checked the compatibility of the bootloader with the target version|Prepared a USB cable and PC with ADB drivers|Charged the phone by at least 70%-->

2. Unlocking the bootloader: you can’t do without it

On 90% of modern smartphones, the bootloader (bootloader) is locked by default. This means that you will not be able to flash an alternative firmware or roll back to an older version without first doing so. unlocking. The process differs depending on the manufacturer:

For Google Pixel:

  1. Enable USB debugging in Settings → System → For Developers.
  2. Connect your phone to the PC and do: 
    adb reboot bootloader

    fastboot flashing unlock

  3. Confirm unlocking on the phone screen (all data will be erased!).

For Xiaomi: You need to link your account Mi to the device and wait 7-15 days (!) on some models. Use the command: 

fastboot oem unlock

For Samsung: Unlocking is possible only through the mode OEM Unlock in the developer settings, but on new models (for example, Galaxy S23) this can block Knox and void the warranty.

💡

If unlocking the bootloader results in an error OEM unlock not allowed, try waiting 7 days with USB debugging enabled or use the utility SamFW Tool to bypass restrictions (at your own peril and risk!).

⚠️ Attention: Unlocking the bootloader on devices s Samsung Knox (for example, Galaxy S22 Ultra) will cause the flag to be irreversibly triggered. data-i="108">🚫 Inability to use Knox 0x1. It means:

  • 🚫 Loss of warranty
  • 🚫 Inability to use Samsung Pay, Secure Folder and some banking applications
  • 🚫 Potential problems with OTA updates in the future

3. Downgrade methods: which one to choose?

There are three main methods. rollback to an old version of Android. The choice depends on the phone model, available tools and your experience. Below is a comparative table with the pros and cons of each method:

Method Suitable devices Pros Cons Difficulty
Fastboot (official) Google Pixel, Xiaomi, OnePlus, Motorola ✅ Official firmware
✅ Minimal risk of bricking		 ❌ Requires an unlocked bootloader
❌ Data reset		 Average
ODIN (Samsung) Samsung Galaxy (all models) ✅ Works without unlocking the bootloader (on older models)
✅ Supports multi-component firmware		 ❌ Risk trigger Knox
❌ You need the exact firmware version by region (CSC)		 High
Custom Recovery (TWRP) Any devices with an unlocked bootloader ✅ Possibility of custom firmware (system, boot)
✅ Saving data (sometimes)		 ❌ Risk of kernel incompatibility
❌ May break encryption		 High
OTA downgrade Google Pixel, some Xiaomi ✅ No data loss (sometimes)
✅ Does not require a PC		 ❌ Works rarely
❌ May block future updates		 Low

For most users the most reliable method is flashing. via FastbootIt is suitable for devices with an unlocked bootloader and official firmware. For example, for Google Pixel 6 the process looks like this:

  1. Download factory-image for your model from the Google website.
  2. Unpack the archive and run the script flash-all.bat (Windows) or flash-all.sh (Linux/Mac).
  3. Wait for completion - the phone will automatically will reboot.

What to do if Fastboot gives an error device not found>?

Make sure ADB drivers are installed (download Google USB Driver or Universal ADB DriverTry another USB cable (preferably original) and a USB 2.0 port on your PC. If the problem persists, check the output. commands adb devices —the device should be displayed in the list.

4. Step-by-step guide: downgrade via Fastboot

Let's look at the universal rollback method using an example Xiaomi Redmi Note 11This method is also suitable for other devices with an unlocked bootloader. (for example POCO X3 Pro or Realme GT).

Step 1. Installing tools

  • 🖥️ Download and install Android SDK Platform-Tools (includes adb and fastboot).
  • 🔌 Connect your phone to the PC and check the connection: 
    adb devices

    (the serial number of the device should appear).

Step 2. Switch to Fastboot mode

  1. Turn off the phone.
  2. Hold Volume down + Power (on some models - Volume up + Power).
  3. Connect the phone to the PC - a message should appear on the screen Fastboot mode.

Step 3. Old version firmware

  1. Unpack the downloaded firmware (for example, toco_global_images_V13.0.6.0.SKFMIXM_20221010.0000.00_12.0_global.zip for Redmi Note 11).
  2. In the folder with the firmware, find the file flash_all.bat and run it as administrator.
  3. Wait for completion - the process may take 5-15 minutes.

💡

If the firmware is interrupted with error anti-rollback>, this means that you are trying to install a version that is too old. Check the list of supported versions for your model on the forum XDA or the manufacturer's website.

5. Downgrade on Samsung: features and risks

Device Samsung require a special approach due to the proprietary firmware and protection system Knox. Here you can’t just take any old firmware - you need to take into account:

  • 📱 Model and region (CSC): The firmware must match your region (for example, SER for Russia, XEF for France).
  • 🔒 Bootloader version: On new devices (for example Galaxy S23), you cannot flash firmware older than the one installed at the time of first activation.
  • 🔄 Anti-rollback rule (anti-rollback): Samsung blocks rollback on a version older than a certain patch level.

Instructions for Samsung (for example Galaxy A52):

  1. Download the firmware via Frija or SamFirm (specify the model and CSC).
  2. Unpack the archive - you will receive the files AP, BL, CP, CSC (or HOME_CSCif you want to save the data).
  3. Open Odin3 (version 3.14.1 or later), connect the phone in mode Download Mode (press Volume down + Volume up + USB cable).
  4. Upload files to the appropriate fields in Odin and press Start.

⚠️ Attention: If you are flashing Samsung s with a locked bootloader, use only official firmware via Odin. An attempt to flash a custom recovery (TWRP) or a modified kernel will trigger Knox and possible blocking of the device.

💡

To avoid problems with Knox, before downgrading, check its status in the mode Download Mode. If it says Knox Warranty Void: 0, unlocking the bootloader or flashing unofficial software will lead to a change. on 1 (irreversible!).

6. Solving problems after downgrade

Even if the process was successful, problems may arise after the rollback. Here are the most common ones and how to fix them:

Problem Possible reason Solution
The phone does not turn on (brick) Incompatible firmware or interrupted process Repeat the firmware via Fastboot or Odin. If it doesn’t help, look for EDL firmware (requires an authorized account for some brands).
Constant reboots (bootloop) Partition damaged boot or incompatible kernel Flash separately boot.img via Fastboot: 
fastboot flash boot boot.img
Mobile network or Wi-Fi does not work Damaged section modem (on Samsung — CP) Flash only the section modem from the original firmware.
Applications crash or are not installed Version mismatch API or damaged data Reset via Recovery (Wipe Data/Factory Reset).
SafetyNet does not work (banking applications do not work) Unlocked bootloader or modified firmware Use Magisk to disguise root access or flash the official firmware without unlocking.

If after downgrading the phone begins to work slower than expected, check:

  • 🔋 Battery optimization: Go to Settings → Battery → Battery optimization and disable restrictions for frequently used applications.
  • 🧹 System cache: Clear the cache via Recovery (Wipe Cache Partition).
  • 🔄 Background activity: B Settings → Applications limit background work for unnecessary services.

7. Alternatives to downgrade: when a rollback is not needed

Before risk the data and stability of the device, consider alternative solutions:

  • 🔄 Rollback via OTA: Some manufacturers (for example, Googleallow you to return to the previous version through the update menu. Press the button Power + Volume up when the update notification appears - sometimes an option appears Cancel update.
  • 🛠️ Using Launchers: If you don’t like the new interface, install an alternative launcher (for example, Nova Launcher or Lawnchair).
  • 📱 Custom firmware: Projects like LineageOS or Pixel Experience offer pure Android without manufacturer's "tricks", but require an unlocked bootloader.
  • ⚙️ Disabling unnecessary functions: In new versions of Android, you can disable animations, limit background activity, or return the old style of notifications via ADB: 
    adb shell settings put global heads_up_notifications_enabled 0

💡

If your goal is to improve performance, try first resetting the phone to factory settings (Factory ResetOften, the "brakes" after the update are not related to the firmware itself, but to). accumulated cache and application data.

8. Frequently asked questions about downgrading Android

❓ Is it possible to downgrade Android without losing data?

On most devices, no. data-i="285">requires a complete reset ( Fastboot or Odin requires a full reset (factory reset). The exception is downgrade via TWRP with selective flashing of partitions (system, boot), but this is risky and can lead to unstable operation.

Create a backup copy first. via adb backup or applications like Swift Backup (requires root). Synchronize photos and contacts with Google Account.

❓ Why does the mobile network not work after a rollback?

This is a typical problem when incompatible firmware modem (on Samsung file CP). Solution:

  1. Download the original firmware for your model.
  2. In Odin flash only the partition CP (without touching the rest!).
  3. Restart the phone and check the network.

If the problem persists, check the APN settings in Settings → Mobile network → Hotspots access (APN). version of the bootloader. Look for a list of supported versions on.

❓ How do I know if my device supports downgrade?

Check two key parameters:

  1. Anti-rollback policy (anti-rollback): On devices Xiaomi, Samsung And Huawei You cannot flash firmware older than a certain bootloader version. Find a list of supported versions at XDA Developers or in thematic chats.
  2. Loader status: If it is blocked and the manufacturer does not provide an official unlocking method (like Huawei after 2019), downgrade impossible.

To check anti-rollback on Xiaomi use the command: 

fastboot getvar anti

(if the value is more than 3-5, rollback is unlikely).

❓ What to do if the phone does not turn on after downgrading?

First try:

  • 🔌 Connect to charger for 30+ minutes (sometimes helps with a low battery).
  • 🔄 Log in in Recovery (press Volume up + Power) and do Wipe Data.
  • 🖥️ Repeat the firmware via Fastboot or Odin, making sure that the firmware files are not damaged.

If the screen remains black and the PC does not see the device even in Fastboot, the eMMCchip may be burned out or the bootloader is damaged. In this case, only a service center with the equipment will help. for EDL firmware.

❓ Is it possible to roll back Android on a phone with root access?

root access simplify some steps (for example, backup via Titanium Backup), but do not cancel the main ones limitations:

  • ✅ You can flash individual partitions (system, boot) via TWRP without a full reset.
  • ❌ Will not help bypass anti-rollback or a locked bootloader.
  • ⚠️ Risk of losing root after downgrading (you will need to re-patch boot.img via Magisk).

If you already have root, remove modifications before downgrading (disable modules Magisk) and return the stock kernel.

⚠️ Attention: Details of the downgrade process may vary depending on the phone model, firmware version and manufacturer's policy. Before you start, be sure to check the latest information on the brand’s official website or in thematic communities (for example, XDA Developers or 4PDA). Some manufacturers (for example, Huawei and Oppo) are actively fighting rollbacks, blocking such capabilities at the hardware level.