Android 4.0 for zt-180 v2 it's possible? | Android Tablets Forum
Firstly you need to plug from a USB on your PC to the otg port on the pad, then press the large button at the front and the power button at the same time this will allow the pad to be recognized as a new device by the PC then you need to install the secbulk.sys file that is available in the older firmware. Like.