USB_Burning_Tool v 2.0.0 runs on GT1Mini probably also suitable for GT1Mini-2 Beelink boxes react differently to OTG
1). You connect the cable and it is visible immediately
2). Another needs to hold the reset button and connect the usb
3). My GT1Mini works for 3 seconds after plugging and then disconnects from USB_Burning_Tool
installation method:
a). run USB_Burning_Tool on pc
b). connect usb to pc add .img and set it as shown in the SLIMBOX instruction
c). once you've done everything hit "START" in USB_Burning_Tool
d). now connect the box and wait for the process to finish
e). do not use USB 3.0 for this purpose
A). If you have the
https://www.widevine.com/ license, you will lose it by installing this firmware, but if you don't care about widevine it then SLIMBOX is a good choice.
@superceleron, from freaktab, also made an excellent multi rom one for many models 905x2 & 905x3