We can confirm you are following the correct BIOS recovery procedure. Normally after moving the recovery jumper to positions 2-3 you insert the USB flash drive, press F6 to boot from the EFI shell and run the startup.nsh file. If you are not able to get the boot options try to power cycle the board and clear the CMOS battery for one minute and try again. If the issue persists the BIOS got corrupted and the board needs to be replaced.
I have same trouble.
My Mobo is s2600cp2 and bios is 2.15.1227
AMI Aptio setup utility 18.104.22.168 OABVH 0.17 x64 . 03/14/2013
future use version s2600cp.17.09
mrc ver. 1.0.018
on serverboard Bios label = S6C CS:7976 R01.03.0002
I tryed bios update 01.03.002 to the later version, but i failed. Rerurn message is ' a file in the update package is incompatible with the target'
I think that i will must try to update by later version of ami bios.
In my system bios, NIC configuration menu is not present, so my server LAN port's have unabled until now.
Intel S2600CP2 server board is very bad things, seriously bad things , and it's a big trouble maker.