here a update: When i use the SSD of my HP laptop with win11 + B4x and install this in the new PC, B4x and commport are good working. Same USB driver as with the other SSD+B4x+Win11. I think something happend with the win11 installation, as i already explained this drive was used in a other laptop with CPU PSU problems and has cut-off and rebooted many times. The B4x installation on the corrupted SDD installation has been working before, at some point i was getting the messages a shown in the beginning of this topic.