The Samsung Galaxy A20s (model numbers SM-A207F, SM-A207M, and SM-A2070) was originally released with Android 10 and later received an official update to Android 11. Unfortunately, Samsung has not provided any newer official Android updates for this device, meaning Galaxy A20s users have been stuck on Android 11, an operating system that is gradually becoming outdated, with many modern apps no longer receiving proper support.
But here's the great news: you can now upgrade your Samsung Galaxy A20s all the way to Android 16 using a GSI (Generic System Image) build of Lineage OS, and you don't even need a computer to do it!
This guide will walk you through the entire process of installing Lineage OS based on Android 16 onto your Samsung Galaxy A20s using nothing but your phone itself. By the end, your device will be running the latest Android version, apps that no longer worked on Android 11 will function once again, and your phone will feel significantly smoother, faster, and more modern.
⚠️ Important Warnings Before You Begin
Before we proceed, please take a moment to understand what you're doing and the risks involved:
- All Data Will Be Erased: Installing a custom ROM will perform a full data wipe. Back up everything important photos, videos, documents, and app data to Google Drive, an SD card, or another device before starting.
- Warranty May Be Voided: Unlocking the bootloader and installing custom software will trip Samsung's Knox security counter, which may void your official warranty.
- Potential Risks: While this method has been tested and proven to work, any mistake during installation could theoretically cause your device to become unbootable ("soft-bricked"). Follow each step carefully.
- Compatibility: This guide is specifically for the Samsung Galaxy A20s with model numbers SM-A207F, SM-A207M, and SM-A2070. Do NOT attempt this on other Samsung models.
- No Official Support: Lineage OS GSI is not an official build from the Lineage OS team. It is a community-built Generic System Image. Some features may work differently than in official builds.
✅ Prerequisites
Ensure you have all of the following before starting:
- Samsung Galaxy A20s (SM-A207F / SM-A207M / SM-A2070) with unlocked bootloader and TWRP recovery installed
- Battery charge of at least 70%
- Internet connection on your phone to download the required files
- At least 4-5 GB of free storage space
- Complete backup of all your personal data
- If you haven't yet unlocked your bootloader or installed TWRP, you must do those first; they are mandatory prerequisites.
📥 Files You Need to Download
There are two main files you'll need to download. Save them to your phone's internal storage or SD card in a folder you can easily find:
| File | Purpose |
|---|---|
| Lineage OS Android 16 GSI ROM | The actual operating system image |
| Permissive Boot Image | Required kernel to successfully boot Android 16 GSI on Galaxy A20s |
Note: Download links for both files are typically provided in the associated video description or from community sources dedicated to the Galaxy A20s. Ensure you're downloading files specifically built for the Samsung Galaxy A20s / SM-A207.
Once downloaded, extract the Lineage OS GSI file if it came in a compressed format (such as .xz or .zip). You should end up with a file ending in .img this is the system image we'll be flashing.
🔑 Prerequisite: TWRP Recovery Must Be Installed
Before you can flash anything, your Samsung Galaxy A20s must already have TWRP custom recovery installed. If you haven't installed TWRP yet, you cannot proceed with this guide. You'll need to:
- Unlock your device's bootloader first
- Flash TWRP recovery using Odin or the no-PC method
- Verify that you can successfully boot into TWRP
Once TWRP is installed and working, return here and continue with the ROM installation steps below.
📲 Step-by-Step: Install Lineage OS Android 16
Step 1: Boot into TWRP Recovery
- Power off your Samsung Galaxy A20s completely; wait until the screen goes black and the device stops vibrating.
- Press and hold the Volume Up button + Power button simultaneously.
- When the Samsung Galaxy A20s logo appears, release ONLY the Power button while continuing to hold the Volume Up button.
- Keep holding Volume Up until you enter TWRP recovery mode.
Step 2: Flash the Lineage OS System Image
- From the TWRP main menu, tap on Install.
- Instead of selecting a ZIP file, tap on the "Install Image" button (usually located near the bottom or top-right of the screen).
- Navigate to where you saved the extracted Lineage OS system image file (the
.imgfile). - Select the file.
- You'll see a prompt asking which partition to flash this image to;o select System Image.
- Swipe the slider at the bottom to confirm and begin flashing.
- Be patient;nt flashing the system image takes longer than flashing a ZIP file. Let the process complete fully without interrupting it.
- When finished, you'll see a "Successful" message.
Step 3: Flash the Permissive Boot Image
- Tap the "Back" button to return to the file selection screen.
- Tap "Install Image" again.
- This time, select the Permissive Boot Image file you downloaded.
- When asked which partition to flash to, select Boot Image.
- Swipe to confirm and flash the boot image.
- Wait for the "Successful" confirmation message.
Step 4: Format Data Partition (CRITICAL: DO NOT Skip)
- Return to the TWRP main menu and tap on Wipe.
- Tap on Format Data (NOT "Advanced Wipe").
- You'll be asked to confirm by typing "yes".
- Type yes using the on-screen keyboard and confirm.
- Wait for the formatting process to complete.
⚠️ Why this is mandatory: If you skip formatting data, your device will likely become stuck in a boot loop continuously restarting without ever reaching the home screen. This step removes encryption and prepares the data partition for the new Android 16 system.
Step 5: Reboot into System
- Tap the Reboot button in TWRP.
- Select System to reboot into your new Android 16 Lineage OS.
- Be extremely patient at this stage. The first boot after installing a custom ROM takes much longer than usual; anywhere from 5 to 15 minutes is completely normal. You may see the Samsung logo for an extended period. Do NOT assume it's stuck and do NOT restart it manually.
✅ Success! Set Up Your New Android 16 System
Once your Galaxy A20s finally boots up:
- You'll be greeted by the Lineage OS setup wizard, the same initial setup screen you'd see on a new phone.
- To speed things up, you can temporarily enable Airplane Mode during the initial setup to bypass the "Connect to Wi-Fi" and "Copy apps & data" screens quickly.
- Once you reach the home screen, reconnect to Wi-Fi, sign in with your Google account, and restore your apps and data.
- Go to Settings → About Phone and verify that it shows Android 1. Congratulations! You've successfully upgraded your Samsung Galaxy A20s from Android 11 to Android 16!
🧪 Feature Verification & Performance
After installation, take some time to test your device:
| Feature | Status |
|---|---|
| Wi-Fi | ✅ Working securely |
| Mobile Network / Hotspot | ✅ Functional |
| IMEI / Baseband | ✅ Preserved and secure |
| Camera | ✅ Working |
| Fingerprint Sensor | ✅ Functional |
| Audio, Sensors, Display | ✅ Operational |
Overall, Lineage OS Android 16 runs significantly smoother and more responsively than the original Android 11 stock firmware. Apps that were previously incompatible or slow will now run properly. While there may be minor, barely noticeable bugs in some edge-case features, all core functionality calls, messaging, internet, camera, and daily use works excellently.
⚠️ Troubleshooting Common Issues
Device Stuck in Boot Loop / Won't Boot Past Logo
- Cause: You skipped the "Format Data" step or flashed an incompatible file.
- Fix: Reboot into TWRP → Wipe → Format Data → type "yes" → confirm → Reboot.
TWRP Can't See Internal Storage
- Cause: Encryption hasn't been removed.
- Fix: Complete the "Format Data" step; this removes encryption and makes storage accessible.
Certain Features Not Working After Boot
- Some minor features may have bugs specific to GSI builds compared to official device-specific ROMs. This is normal and varies by build.
📌 Important Notes
- This method does NOT require a computer everything is done directly on your Galaxy A20s using TWRP recovery.
- Always format data; skipping this step is the #1 cause of boot loops and installation failures.
- The permissive boot image is mandatory.y Android 16 GSIs require a kernel with permissive SELinux to boot properly on the Galaxy A20s.
- Backups are essential: any custom ROM installation wipes everything, so save your data first.
- Future updates: To switch to a different custom ROM or newer Android version later, you'll follow essentially the same process download the new image, flash it through TWRP, format data, and reboot.
Conclusion
Upgrading your Samsung Galaxy A20s from Android 11 to Android 16 using Lineage OS GSI is a fantastic way to breathe new life into a device that Samsung has officially left behind. By following this gu,ide unlocking your bootloader, installing TWRP, flashing the Lineage OS system image, flashing the permissive boot image, formatting data, and reboo,ting you can enjoy the latest Android experience without ever needing a computer.
Your Galaxy A20s will feel faster, apps will work again, and you'll have all the modern features and improvements that Android 16 brings. Just remember to back up your data first, follow each step carefully, and never skip the Format Data step.
If you found this guide helpful, consider sharing it with other Galaxy A20s users who might want to upgrade their devices too. Enjoy your new Android 16 experience!
