Link: https://twrp.me/samsung/samsunggalaxys3internationalexynos.html (Download twrp-3.3.0-0-i9300.img.tar for Odin)
Look for the thread titled "[ROM][10.0][LineageOS 17.1][Unofficial]" hosted by trusted community developers. samsung s3 custom rom android 10 link
The most stable and widely used Android 10 ROM for the Galaxy S3 (i9300) is , maintained by recognized community developers on XDA Forums. LineageOS 17.1 (Android 10) for GT-I9300 (XDA Forum) Link: https://twrp
Open Odin, click on the slot, and select the downloaded TWRP .tar file. Ensure your phone has at least 70% battery
A: No. Snapdragon S3s have locked bootloaders that cannot be bypassed for Android 10. Maximum is Android 7.1 Nougat.
Ensure your phone has at least 70% battery to prevent it from shutting down mid-process.
If your device gets stuck on the boot animation for longer than 20 minutes, boot back into TWRP, perform another advanced wipe (excluding internal storage), and re-flash the ROM and GApps files carefully.