Unable to erase disk0 on ASA from ROMMON

[Milan Benes]

Hi,

I am unable to erase disk0: from ROMMON mode on ASA 5525-X firewall. The operation starts but ends with errors nb_biosdisk err 3. Does it mean that the internal flash memory is corrupted, could not be repaired and must be replaced?

Thanks a lot.

ASA 5525-X, ROMMON Version2.1(9)8

[manabans]

Indeed, there is an issue with the internal flash memory.
Attempt 'erase all' from the rommon mode. Also, try to reboot the device, to validate if the flash gets recovered.