Thank you edwardzh for your help,
If I understand correct, that only way to flash the bios its via recovery mode or via jtag.
Since that I can flash BMC in regular mode and BNC working well after it, I guess that production bios will work.
The problem:
1. or where I can find rml.rom for my current bios for recovery options
2. where I can find jtag interface scheme for connection and what type of bios chip inside?
Can you help me with it please