Enthusiast communities like SmallFormFactor.net and Win-Raid maintain checksum-verified BIOS dumps. Search for threads tagged [BIOS] Nutmeg Rev 10 .
If your board still posts, you can access the BIOS settings without a programmer: nutmegminiitx rev 10 bios bin file
HP rarely provides a direct .BIN download. Instead, you have to extract it from their update package: Enthusiast communities like SmallFormFactor
This is the part most tutorials skip.
Note the voltage—most are 3.3V, but some rare revisions use 1.8V. but some rare revisions use 1.8V.