Recently,Jiayu had released their official develop ROM for S3 mtk6752. This ROM can fit for 2GB RAM S3 and 3GB RAM S3S. Just the NFC function can not work in S3S.
ROM link: http://pan.baidu.com/s/1dDtV2sp Password: jht9
Please know that this ROM is just a develop version. Some bugs exsit and No Google Apps included:
Exsited Bugs are:
1. No ringstone file. User need to set their own ringstone;
2. Front camera don’t optimized well.
3. Don’t support NFC
4. Loudspeaker don’t optimized well
If stable Android 5.1 OS for Jiayu S3 comes up, we will list soon
Android 5.1 ROM Upgrade in 6.17 : http://pan.baidu.com/s/1gdB2ZlD Password: jk5h (No Google Apps, Installation by Flash tool)
Due to this ROM has no Google Apps like Play Store, Gmail, you can install custom Jiayu s3 Lollipop recovery to install Gapps and root your s3