Turn off your phone. Boot into TWRP Recovery by pressing until the Samsung logo appears, then release the power button.
The installation process requires completely wiping your phone’s internal storage. Back up all crucial data first.
: The most stable unofficial build is LineageOS 17.1 for i9300 (AndroidFileHost). samsung s3 custom rom android 10 link
Because this is a very old device running a new OS, there are limitations:
Go to the official TWRP website or the dedicated XDA thread for the GT-I9300 TWRP recovery. Ensure you are downloading TWRP version 3.3.x or higher in .img format (for flashing inside recovery) or .tar format (for flashing via Odin). Step-by-Step Installation Guide Turn off your phone
or a ), I can make sure the links are the best for you. Also, tell me if you'd like to: Learn how to backup your current system first. Find out which apps run best on this Android 10 setup.
: Includes Android 10 features like a new partial screenshot UI, "ThemePicker" for deep customization, and improved privacy controls . Back up all crucial data first
Find Window animation scale , Transition animation scale , and Animator duration scale . Change them all from 1.0x to 0.5x or turn them off completely. This makes the UI feel instantly faster.
: Developed by contributors like ChronoMonochrome , this ROM brings Android 10 to the legacy I9300 model .
Installing a custom ROM will wipe all your data. Always perform a in TWRP before proceeding.
Failing to follow instructions carefully can result in a "bricked" (unusable) device. Proceed at your own risk. Technical Prerequisites