Inspiron 5675, dead after SSD BIOS update, BIOS password protection

Hi

i just upgraded the bios for the SC311 drive in the 5675. Update went well and proposed a reboot.

During this reboot i went to the bios and disabled that a bios password can be set. (there was also no password)

Since then the PC is not booting. I even dont get the BIOS welcome screen.

Below what i already tried:

- tested M2 sdd in another PC : worked

- tested with another GPU : no effect

- tried to reset CMOS: jumper 1 set to shortcut 5-6. no effect

- unplugged battery for some minutes: no effect

- tried to test POST by unplugging all memory: worked got the 2x AMBER blink code

Anybody with some ideas ?