RockTek G2 (Homatics) can't install CE. Keeps rebooting

First install on new RockTek G2. Android TV works perfect.

It just keeps rebooting shortly after the RockTek logo appears if USB or SD are inside. In a loop.
I did everything based on the manual.
I tried different USB sticks and SD cards. CE21 and CE20.
I tried the reset button and the ADB reboot update command.
PS: tried different dtb
Dont know what to try next

There is only one option left: solder the UART to the board and see what happens.

A post was merged into an existing topic: Homatics Box R 4K Plus