[REQUEST] AMI Microcode update on Fujitsu server board S771

Tried installing 2 Xeon L5420 (SLARP) on Fujitsu Econel 200 S2 socket 771. It is supposed to support them but the system doesn't boot with them. Currenly using Xeon 5148.
Chipset is Intel 5000v.
Bios is here: http://www.morrberg.com/fujitsu-bios-update/AMIBOOT.ROM

Is it possible to whiteflag ram ? If i use non fujitsu ram, the systems complaints..

Thanx in advance!