Based on: Lenovo_A850_S121_ROW (130929)
Recovery: CWM 6.0.34 – thanks to Cappa72
Installed Google apps: Play, Music, Gmail, Youtube, Chrome, Maps
Lenovo AnyShare, LeNote, LeStore, LeSync removed. See versionlist.csv for more information about original Lenovo apps.
Launcher: Lenovo Launcher
Supported languages: English, Español, Français, Magyar (default), Русский, Српски, Українська
More translations (mainly czech, slovak, polish, deutsch) are welcome, please contact me in PM.
Apps on SD not supported.
How to install:
1., Install USB drivers
2., Start Flash_tool.exe from ..SP_Flash_Tool_v3.1320.0.163 folder
3., Click Scatter-loading then locate MT6582_Android_scatter.txt from ..target_bin folder
4., Select and tick Options->DA Download all->Speed->Do not Switch speed in the menu
5., Tick DA DL All With Check Sum
6., Click Firmware Upgrade button and take a while (7-10 min).
Reboot your phone. First boot will take a longer time, so please wait.
Do not forget: If you got "Invalid IMEI", then go to recovery and do a restore to factory settings.