Downgrading the computer BIOS can break features that are included with later BIOS versions. Intel recommends you only downgrade the BIOS to a previous version for one of these reasons:
You recently updated the BIOS and now have problems with the Intel® NUC. Examples: Computer does not boot, features no longer work.
You got a replacement Intel NUC through warranty that has a newer BIOS than what your company has standardized on.
The steps to downgrade a BIOS to an older version are the same as for upgrading to a newer version. You are prompted to confirm that you really want to downgrade the BIOS. Confirm that you want to downgrade, and continue the update process.
Since Intel NUC products support the Intel® Management Engine (Intel® ME), BIOS downgrades are not recommended for security reasons. If a BIOS with Intel ME must be downgraded, and the downgrade affects the Intel ME version, the BIOS Recovery Update is the only method you can use.
Select your preferred BIOS update method for complete instructions: