First : download the  usb burning tool

and install it:

Second : when install finish ,open the tool, found the left_top click "File" import a zidoo_A5 image file

Import a image file choose it

A5S: (

It would check few second.

SelectConfigration: Erase flash:Normal erase(if not this option, your box may not be activated) and Click "Start" switch to "Stop".

Use the doble usb cable one connect to the usb2/OTG port on box , one connect to PC usb port.

When it response, you can see a progress bar and just waiting for some times.

wait about 2 minute will burning success.