Samsung Galaxy S8, released in 2017, initially worked on Android 7.0 Nougat, but officially supported updates to Android 9.0 Pie. However, many users want features Android 10 —a more modern interface, improved performance, and new security features. In this article we will look at how to flash Galaxy S8 (G950F/G955F) on Android 10 with minimal risks, including preparing the device, selecting firmware and solving common errors.

It is important to understand: there is no official update to Android 10 for S8 there is no need to use custom firmware (for example, LineageOS or Pixel Experience). This requires unlocking the bootloader, installing a custom recovery and careful preparation. If you are a beginner, it is better to study the theory first or contact a specialist. Otherwise, you risk getting a “brick” - a non-working phone.

We will look at two main ways: firmware via Odin (for official modified assemblies) and installation of custom firmware via TWRP. We will also look at which functions may not work correctly after the update, and how to fix it. If your goal is to simply update the system without losing the warranty, alas, this method will not work: any unofficial firmware will void the warranty Samsung.

📊 Have you already tried flashing Android devices?
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Tried 1-2 times
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1. Preparing the Samsung Galaxy S8 for firmware

Before you start flashing the firmware, you need to complete several critical steps. Neglecting them can lead to data loss, system damage or even physical breakdown devices. Let's start with backup.

Create a complete copy of all data: contacts, photos, messages and applications. To do this, you can use:

  • 📱 Samsung Smart Switch — official software for backup on a PC.
  • ☁️ Cloud services: Google Drive, Dropbox or Samsung Cloud.
  • 💾 Local copying to microSD or external drive (for example, via MTP in file transfer mode).

Next, check the model of your Galaxy S8. Firmware for SM-G950F (regular version) and SM-G955F (S8+) are not interchangeable! You can find out the model in Settings → About phone → Model or on the sticker under the SIM card slot. Also make sure that the battery charge is at least 80% - this will prevent sudden shutdown during the firmware.

⚠️ Attention: If your Galaxy S8 purchased from a telecom operator (for example, MTS, Beeline), it may have a locked bootloader. In this case, flashing custom software is impossible without unlocking through special services (for example, Samsung Unlock).

The last stage of preparation is installing the necessary tools on the PC:

  • 🖥️ Samsung USB drivers (download from the official website Samsung).
  • 🛠️ Odin3 (version 3.14.1 or later) - for firmware via PC.
  • 🔧 Platform Tools (includes adb and fastboot) - for working with custom firmware.
  • 📦 The firmware itself (official modified or custom, for example, LineageOS 17.1 for Android 10).

Make sure that the phone model matches the firmware|Make a backup copy of all data|Charge the battery to 80% or more|Install drivers and Odin on the PC|Download the correct firmware version-->

2. Unlocking the bootloader and installing TWRP

To install a custom one. firmware Android 10 on Galaxy S8 you need to unlock the bootloader and install custom recovery TWRP. This process erases all data on the device and can trigger KNOX (protective flag Samsung, which blocks some functions, for example, Samsung Pay).

Instructions for unlocking the bootloader:

  1. Activate Developer mode: go to Settings → About phone → Build number and click on it 7 times.
  2. Go back to Settings → Developer options and enable OEM unlocking.
  3. Turn off the phone and press Bixby + Volume down + Powerto enter Download Mode.
  4. Connect the phone to the PC and confirm unlocking via Odin (in the field Options there should be a checkmark just opposite Auto Reboot and F. Reset Time).

After unlocking the bootloader, you can install TWRP. Download the latest version of the recovery for your model (twrp-3.7.0_9-0-dreamlte.img.tar for G950F or twrp-3.7.0_9-0-dream2lte.img.tar for G955F) and flash it through Odin in the field AP. After successful installation, immediately boot into TWRPholding Bixby + Volume Up + Power.

⚠️ Attention: Some versions TWRP may not work correctly with encryption Samsung. If, after installing the recovery, the phone asks for a password, and you did not set it, you will have to perform a reset via Wipe → Format Data (this will delete all data!).

If you plan to use LineageOS or other custom firmware, after installation TWRP it is recommended to immediately make a backup of the current system (Backup → Select Partitions). This will help restore the phone in case of unsuccessful firmware.

What is KNOX and why is it important?

KNOX is a Samsung hardware security system that monitors the integrity of the firmware. When unlocking the bootloader or installing custom software, the flag KNOX 0x1is triggered, which leads to:

- Blocking Samsung Pay and Secure Folder.

- Loss of warranty (even if you later flash the official firmware).

- Inability to use some corporate functions (for example, Samsung DeX in the full version).

The KNOX flag cannot be reset, so weigh all the risks before updating the firmware.

3. Firmware selection: official modifications vs custom builds

On Galaxy S8 can be installed Android 10 in two ways: through official modified firmware (for example, One UI 2.0 based on Android 10 for other regions) or through custom firmware like LineageOS, Pixel Experience or Havoc-OS. Let's look at the pros and cons of each option.

Firmware type Advantages Disadvantages Installation complexity
Official modified (for example, firmware for Galaxy S8 from Korea or the USA)
  • Stable operation.
  • Preservation of basic functions Samsung (for example, Always On Display).
  • Fewer bugs with hardware.
  • Not all functions may work (for example, Samsung Pay).
  • May contain bloatware (pre-installed applications).
  • Requires firmware via Odin.
 Medium
Custom (LineageOS, Pixel Experience)
  • Clean Android 10 without bloatware.
  • Regular security updates.
  • Flexible interface settings.
  • The camera and sensor may not work fingerprints or Always On Display.
  • Requires bootloader unlocking and TWRP.
  • No official support Samsung.
 High

If you choose official modified firmware, you need to look for it on trusted resources, for example, SamMobile or Updato. Please note the region (CSC): firmware for Korea (KOO) may not be suitable for Russia (SER)For custom firmware, the best source is the forum. data-i="176">, where stable assemblies with instructions are published. XDA Developers, where stable builds with instructions are published.

Important: Firmware from another region may not work mobile communication or errors with the SIM card. Before installation, check the compatibility of the CSC code!

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If you choose custom firmware, pay attention to the kernel version for Galaxy S8 assemblies based on the kernel are better suited 4.4.x or newer - they provide better compatibility with hardware.

4. Firmware via Odin (official modified firmware)

If you decide to install the official firmware Android 10 (for example, the Korean version One UI 2.0), follow these instructions. The method is suitable for those who do not want to lose the main functions Samsung, but are prepared for possible limitations (for example, the absence of the Russian language in some assemblies).

Firmware steps via Odin:

  1. Download the firmware in format .tar.md5 (for example, G950FXXU4DUB3_G950FOJM4DUB3_SER.tar.md5).
  2. Unzip Odin and run it as administrator.
  3. Turn off the phone and put it in Download Mode (Bixby + Volume down + Power).
  4. Connect the phone to the PC IN Odin a message should appear Added! in the log.
  5. In the field AP select the firmware file. If the firmware consists of several files (BL, AP, CP, CSC), upload them to the appropriate fields.
  6. Press Start and wait for completion (usually takes 5-10 minutes).

After the firmware is installed, the phone will automatically reboot. The first startup may take up to 15 minutes - do not interrupt the process! If after the update the phone is stuck on the logo Samsung, perform a reset. via Recovery Mode (Bixby + Volume up + Power → Wipe data/factory reset).

⚠️ Attention: Firmware of an official modified assembly can lead to a reset DRK (a flag similar to KNOX), which will block some functions. For example, if you flash Korean firmware on. European Galaxy S8may stop working Samsung Pay and Secure Folder.

If the mobile network does not work after the firmware, check the settings APN or flash the modem separately (file with extension CP v Odin). To do this, download the latest version of the modem for your model at SamMobile.

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Firmware via Odin is the most reliable way to update the Galaxy S8 to Android 10 without losing basic functions, but requires careful selection of the regional version (CSC).

5. Installing custom firmware (LineageOS, Pixel Experience) If you prefer a clean one without a shell, custom firmware is your choice. The most popular options for

If you prefer clean Android 10 without shell One UI, custom firmware is your choice. The most popular options for Galaxy S8:

  • 📱 LineageOS 17.1 - stable build with minimal bugs.
  • 🎨 Pixel Experience - firmware with interface and functions Google Pixel.
  • ⚡ Havoc-OS - custom firmware with advanced settings.

Installation instructions (using example LineageOS 17.1):

  1. Download the firmware (lineage-17.1-20230510-UNOFFICIAL-dreamlte.zip) and Gapps (for example, OpenGapps for Android 10, option nano or pico).
  2. Restart the phone in TWRP (Bixby + Volume up + Power).
  3. Perform a hard reset: Wipe → Advanced Wipe → check Dalvik / ART Cache, System, Data, Internal Storage (it is not necessary to format the internal memory, but it is recommended to avoid conflicts).
  4. Install the firmware: Install → select the LineageOS file → swipe to confirm.
  5. Install in the same way Gapps.
  6. Reboot phone: Reboot → System.

The first launch may take up to 20 minutes. If the system does not boot for more than 30 minutes, repeat the installation process or check the compatibility of the firmware with your model.

Typical problems after installing custom firmware and their solutions:

  • 📵 The mobile network does not work: check the settings APN or flash the modem separately (CP file via Odin).
  • 📷 The camera gives an error: install a patch for the camera (for example, S8 Camera Fix for LineageOS).
  • 🔋 Fast battery drain: calibrate the battery (discharge to 0%, charge to 100% without interruption) or install a kernel with optimized power consumption.
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If after installing custom firmware the fingerprint sensor does not work, try flashing an alternative kernel, for example Arter97 Kernel, which better supports biometric sensors on the Galaxy S8.

6. Optimization and configuration of Android 10 after flashing

After successful flashing Android 10 on Galaxy S8 it is recommended to perform several steps to optimize performance and fix possible bugs.

First, what you should do is disable unnecessary background processes and applications:

  1. Go to Settings → Applications and disable pre-installed apps that you do not use.
  2. In Settings → Battery → Optimization mode select Optimized for most applications.
  3. Activate Developer mode and enable Window animation = 0.5x, Transition animation = 0.5x to speed up the interface.

If you have installed a custom firmware, you may have to manually configure some functions:

  • 🔊 Sound: in LineageOS there may be no uniform volume control. Install the module ViPER4Android to improve the sound.
  • 📶 Wi-Fi/Bluetooth: if the connection is unstable, update drivers via Settings → System → Advanced → Developer options → Wi-Fi scan throttling (disable this option).
  • 🔋 Battery: Use apps like AccuBattery to monitor battery health and calibrate.

You can install an alternative kernel to improve performance, for example, Arter97 Kernel or Perseus Kernel. These kernels are optimized for Galaxy S8 and allow you to:

  • Increase battery life.
  • Improve multitasking.
  • Add support for new functions (for example, Wireless DeX).

Kernels are installed via TWRP similar to firmware. After installation, do not forget to clear the cache (Wipe → Dalvik / ART Cache).

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Custom kernels can significantly improve the performance of the Galaxy S8 on Android 10, but choose only those that are compatible with your firmware and phone model.

7. Solving common problems after flashing

Even with correct installation Android 10 on Galaxy S8 errors may occur. Let's look at the most common ones and how to eliminate them.

Problem Possible cause Solution
The phone does not turn on after flashing Incompatible firmware or interrupted installation process Repeat the firmware via Odin or TWRP, making sure the files are correct
Stuck on the logo Samsung or LineageOS Data conflict or incomplete cleaning before flashing Perform a full reset (Wipe Data) via TWRP
Touchscreen or buttons do not work Wrong kernel or firmware for another model Flash the correct kernel or return to stock firmware
No mobile network Incompatible modem or incorrect settings APN Flash the modem via Odin (file CP) or configure APN manually
Fast discharge batteries Unoptimized kernel or background processes Install a custom kernel or calibrate the battery

If after the firmware Android 10 stopped working Google Services (for example, Play Market or Gmail), most likely the problem is in Gapps. Try:

  1. Delete current Gapps via TWRP (Mount → System, then delete the folder /system/priv-app/GmsCore).
  2. Install another version Gapps (for example, NikGapps instead OpenGapps).
  3. Clear cache and data Google Play Services in application settings.

If none of the methods helped, return to the stock firmware via Odin and repeat the process with another assembly Android 10.

⚠️ Attention: If after flashing the phone no longer sees the SIM card, check whether your firmware supports your region. Some custom builds (especially for Galaxy S8 from the USA) may not work with Russian operators. In this case, you will have to look for an alternative firmware or patch for the modem.

8. Return to original firmware (rollback from Android 10)

If Android 10 it is unstable or you need to return the phone to its original state (for example, for sale or warranty repair), you can flash the original firmware via OdinThis process is called "downgrade" and has its own. nuances.

Instructions for returning to stock firmware:

  1. Download the official firmware for your model (for example, G950FXXU9ESHA_G950FOXM9ESHA_SER.tar.md5 for Galaxy S8 with region SER).
  2. Unzip Odin and run it.
  3. Move your phone to Download Mode (Bixby + Volume down + Power).
  4. Connect your phone to the PC and wait for the message to appear Added! in Odin.
  5. In the field BL upload the file BL_G950FXXU9ESHA.tar.md5, in AP — AP_G950FXXU9ESHA.tar.md5, and so on for CP and CSC.
  6. Press Start and wait for completion (usually 5-10 minutes).

After returning to stock firmware:

  • The phone will automatically reboot and perform the initial setup.
  • The flag KNOX will remain triggered (0x1), but the main functions (except Samsung Pay and Secure Folder) will work.
  • If you need to reset counter Odin (shows the number of firmwares), use the patch Reset Odin Counter, but it will not reset KNOX.

If after downgrading the phone does not turn on or is stuck on the logo, reset via Recovery Mode:

  1. Hold Bixby + Volume up + Power to enter recovery.
  2. Select Wipe data/factory reset.
  3. Reboot the phone (Reboot system now).
⚠️ Attention: Returning to stock firmware will not restore the warranty if it was the bootloader is unlocked. The manufacturer can determine the fact of installing custom software by the flag KNOX.
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Returning to the original firmware via Odin is the only way to return the Galaxy S8 to the "factory" state, but this will not reset the KNOX flag and will not restore the warranty.

Often asked questions (FAQ)

Is it possible to flash Galaxy S8 on Android 10 without unlocking the bootloader?

No, for installation Android 10 (especially custom firmware) you definitely need to unlock the bootloader. Without this, the phone simply will not allow you to flash unofficial software. The exception is official firmware via Odinbut for Galaxy S8 there is no official update to Android 10 therefore, you will have to use modified assemblies that also require unlocking.

Will Samsung Pay work after flashing the firmware on Android 10?

Most likely not. Samsung Pay tied to the flag KNOXwhich is triggered when the bootloader is unlocked or custom software is installed. Even if you return to the stock firmware, Samsung Pay will remain locked. Alternatives: Google Pay (if the firmware supports Google Services) or other payment systems like Mir Pay.

How to check if the firmware is compatible with my Galaxy S8 model?

Check the phone model in Settings → About phone → Model. The firmware must exactly match your model:

  • SM-G950F - normal Galaxy S8.
  • SM-G955F — Galaxy S8+.

Also pay attention to the region (CSC): firmware for SER (Russia) may not be suitable for KOO (Korea). Incompatible firmware will lead to a bricked phone!

Why does the battery drain quickly after updating Android 10 firmware?

This is a typical problem when switching to custom firmware. Reasons: