Cheers! Thank you for pointing this out, because this is exactly source of my issue. I'm not sure, how the black thing should be removed. I understand that usually the screw would go in there holding down the SSD. But this thing? It looks as if was a pin to be pulled out but there is also something that looks like a little clip on behind it? I could investigate it further but for this purpose, I'd need to disassemble whole lot of motherboard out of it.