Upgrade Ark Benefit M503 to Android 7.1.2 Nougat
Download latest firmware Android 7.1.2 Nougat for smartphone Ark Benefit M503
The latest firmware android 7.1.2 nougat, starting upgrade from a PC with Windows 10/8.1/8/7/XP (this is a custom firmware for this smartphone, you install it as is).
The driver of the USB and software to update the firmware of the smartphone (run the .exe file for help on upgrading and starting the update).
Root firmware android 6.0.1 marshmallow (rip from original firmware ark benefit m503).
Update firmware for other Ark smartphones.