Swipe the slider at the bottom to format. (Note: Do not wipe Micro SD card, as your installation files are stored there). Step 4: Flash Android 10 and GApps Go back to the TWRP main menu and tap . Tap Select Storage and choose your Micro SD card . Browse and select the LineageOS 17.1 zip file .
What is showing on your phone or computer screen? At which step of the guide did the process stop working? samsung s3 custom rom android 10 link
Ensure your device is charged to at least 70% to prevent unexpected shutdowns during the flashing process. Swipe the slider at the bottom to format
If you experience rapid battery depletion, calibrate the battery by letting it drain to 0% and charging it uninterrupted to 100% while powered off. samsung s3 custom rom android 10 link