The most stable and actively maintained Android 10 ROM for the international S3 (Exynos 4412) is:
LineageOS 17.1 – Unofficial build by developer rINanDO (credits to the LineageOS team and Android-andi)
⚠️ Note: Android 10 on S3 is not for daily heavy use, but it’s excellent for experimenting, light usage, or dedicated media player.
Because the Galaxy S3 is so old, it does not support "Project Treble" (a modular Android system introduced in Android 8). Therefore, you cannot simply install a standard GSI (Generic System Image). samsung s3 custom rom android 10 link
Instead, you must use a dedicated custom ROM built specifically for the S3 kernel. The most prominent Android 10 projects for this device were part of the LineageOS 17.1 unofficial builds.
The Samsung Galaxy S3 (GT-I9300), released in 2012, originally shipped with Android 4.0.4 (Ice Cream Sandwich) and was officially updated to Android 4.3 (Jelly Bean). Thanks to the dedicated developer community, the device can still run Android 10 via custom ROMs, breathing new life into this classic smartphone.
The Samsung Galaxy S3 (GT-i9300) is one of the most iconic Android devices in history. While the official software support ended years ago (stuck on Android 4.3 Jelly Bean), the developer community has kept this device alive. The most stable and actively maintained Android 10
Installing a modern operating system like Android 10 on hardware from 2012 is a testament to the modding community, but it requires specific knowledge about custom recoveries, file formats, and device variants.
Q: The ROM fails to install with "Error 7". A: Your TWRP is too old. Download the TWRP link provided above.
Q: I have no mobile network / IMEI is null. A: You flashed a ROM meant for a different variant. Your EFS partition is corrupted. Restore your stock backup immediately. This is why we warned about variants. ⚠️ Note: Android 10 on S3 is not
Q: The Play Store keeps crashing. A: You flashed the wrong GApps. You must use ARM 10.0 PICO only. Wipe System and re-flash ROM + correct GApps.
Q: Is there an Android 10 ROM for the Snapdragon variant (US S3)? A: No. Snapdragon S3s have locked bootloaders that cannot be bypassed for Android 10. Maximum is Android 7.1 Nougat.