This is based on MANNUR LENOVO derived firmware with build.prop optimisation with FULL GApps and NO Chinese bloatware. First install TWRP recovery on any version A889 then flash the optimised firmware with a second accompanying SystemUpdate.zip to achieve full compatibility minus all Chinese bloatware.
Wipe Dalvik-cache first. it WILL NOT delete installed 3rd part apps you have downloaded on your phone , only it will delete the System app. So any PinYin and Chinese keyboard app in the system will also be deleted. You will have to reistall PinYin and Chinese keyboard from Playstore.
To Flash recovery you can either use Mobile Uncle Tool (If your phone is Rooted with VROOT) after the installation of this firmware you will be Rooted correctly with SuperSU+busybox with SuperSU 1.94 or you can use SPFlashtool to flash the recovery from PC.The recovery TWRP recovery is the same for both A880/A889 (so dont be surprised to see A880 recovery)
To get into recovery press both Vol+/- and then Power button or install any "Quick boot"app it should come with Reboot into Recovery" option.