DESCRIPTION

ViperOS 7.1.2 firmware this is AOSP with some tweaks. There are Gapps, Root is.

I collected the firmware from the sources

The installation via TWRP
Be sure to make a Backup, in case something goes wrong.
1. Download the firmware, place it in the root directory of the cd card or phone memory.
2. Turn the smartphone into recovery mode and make a wipe: Dalvik/ART Cache, System, Cache, Data.
3. Go to "Setting" and select the firmware, then start the installation.

※Please make a backup of your device before installing or updating ROM