Install via TWRP Recovery (recommend JanMae version) it is all in the SPFlashTool_Driver_TWRP file given.
As released by Admin NeedRom this is the DEVeloper version 1501Vibe2.0 but already installed on phones in Malaysia with changed Lock screen and boot up screen (can be change later through Lenovo THEME app). All are functioning properly NO random reboots like s1439.. All GApps functios are normal (Calendar/Maps/YouTube,Hangouts/GooglePlus ect.)
But to avoid problems after a ROM upgrades I have scripted the ROM to format the phone (you WILL loose ALL installed apps) I advised you to doa full backup of your downloaded apps. (Do not backup your apps data!It is better to setup from scratch to avoid errors) This will have to be installed via TWRP Recovery already on your phone( do you have TWRP installed already on your phone??)