Problem with TFMTKAW01232 TrekStor Surftab theatre L15 MTMT8163

[starbury]

Hello people,

I bought a used TrekStor Surftab theatre L15 TFMTKAW01232 and the MT8163 in the hope that I can repair it.

The problem with the device is that it is not possible to boot and after pressing the Volume + and On button for some time, I get into the boot menu. Here I have the choice of recovery, fastboot, norma bootl. No matter which selection I make, the tablet remains dark and nothing happens next.

I got myself a USB-A to USB-A cable and searched for the original Rom and found it. When trying to flash it with the SP_Flash_Tool I get the error "ERROR: S_BROM_CMD_JUMP_DA_FAIL".

What I notice is that the device seems to stay connected via USB only very briefly. I have already installed several drivers and in the tool it also shows me
the connected device "MediaTek USB Port_V1633 (COM4 on)".

Do you have any other idea how I could solve the problem?