Boot from M2 SSD not possible - Raspbian CAN boot

Hi there, can’t boot from the connected M2 SSD.
The Raspberry can boot without problems with the same SSD and Raspbian Lite.

I also tried the bootcode.bin and the timeout file - but without success.
Additionally I tried four different power supply’s - also no success.

Raspberry 3B and Raspberry 3B+
SSD Kingston A400 240GB M2
USB SATA chip ASMedia 1153E

Any help is highly appreciated.


Nobody has an idea here?

What I don’t understand is:
Why can Raspbian Lite boot from the SSD and can not?

From my point of view that shows, that the problem has to be with and not the hardware, right?