To install Android 10 on a Samsung Galaxy S3 (i9300) , you must use an unofficial custom ROM, as official support ended years ago. The most popular choice for this is an unofficial build of LineageOS 17.1. Required Downloads Before starting, gather these files on a PC: Custom ROM: LineageOS 17.1 (Android 10) for GT-I9300.
. While these ROMs can breathe new life into older hardware, they are often considered "alpha" or "experimental" for the S3 due to hardware limitations like 1GB of RAM. Available Android 10 Custom ROMs LineageOS 17.1 (Unofficial) samsung s3 custom rom android 10 link
LineageOS 17.1 for S3 Neo (GT-I9301I): A separate variant of the S3 that also has dedicated Android 10 ROM builds available from developers like "Roman designer" . Direct Download Links To install Android 10 on a Samsung Galaxy
S3 Neo Android 10: Specialized builds available via Developer-hosted bit.ly links for the Neo model . Installation Prerequisites Security Updates: The stock ROM is vulnerable to