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TMDSHVMTRPFCKIT connection problem after setting changes (LD1 is not flashing on)

Good afternoon!

I installed the drivers for TMDSHVMTRPFCKIT successfully but the motor did not run when starting the GUI.
But at least the computer could detect the developer's kit and LD1 of USB JP1 flashed green.

Then I changed some advanced settings of the serial driver as follows:

I checked 'Disable Modem Ctrol At Startup' and unchecked 'Serial Enumerator'.
Secondly I changed the BM Options (Latency Timer (msec)) to 1 instead of 16.

Afterwards I unplugged the USB and plugged it in again. The driver couldn't be detected in the Device Manager anymore. I restored the PC to a previous date and also tried to connect the KIT to other PC's but still no sign shown up while connecting.

It seems to be a serious issue of the (M3)JP1-Chip.

I would be happy about any advice concerning this issue!

Thanks in advance!