1. Backup your data and backuprestore.apk.
2. Download brush pack (A850i_R_2.3.61.51-jiajia-201411251821.zip) and save to SD Card: http://m.romjd.com/Rom/Detail/58832
3.Download Lenovo A850I recovery (CN language): http://pan.baidu.com/share/link?shareid=1595891770&uk=210634374
And A850 recovery (EN language): http://pan.baidu.com/share/link?shareid=1595891770&uk=2106343744
5. Download Android 4.2.1 – 4.2.2 – Jelly Bean (forAndroid 4.2.2 Gapps also): http://www.devfiles.co/download/nzmXh3xF/gapps-jb-20130812-signed.zip
Todo:
1. Flash rom Lenovo A850 s203: http://www.needrom.com/download/feb-2014-s203-flashtool-ready/
2. Reinstall Framaroot, unroot and reroot.
3. Install Unclemobile, install A850 recovery for read info, install A850I
4. Boot to recovery mode, install A850i_R_2.3.61.51-jiajia-201411251821.zip
5. Boot to recovery mode, install gapps-jb-20130812-signed.zip. All done, bắt đầu vọc