I've tried to reset the BOOT and BOOTLDR variables from rommon:
Then it warns "Environment checksum in NVRAM failed"
The MSFC restart with the error:
"ROMMon NVRAM area is corrupted. Initialize the area to default values"
And enters in rommon another time
I think it looks a hardware error, true?
or can i format nvram, or copy the ios image or something like that?