Hi,
I can confirm that replacing the Xeon V4 cpu with a V3 in order to flash the BIOS, helps. Thus :
- Be lucky to have a V3 around and put that in (otherwise no way to get to POST) ;
- Boot/Flash the BIOS with 3.x (my X99M was 1.70);
- Put back in the V4 processor (2640 in my case).
- Good to...