Upload the .bin file. Note that some security settings may prevent downgrades through this method if "Permanently disallow downgrades" was previously enabled. :

Downgrading is often done to restore fan control features (removed in later versions like v2.78 and above) or to fix compatibility issues. While the process is generally safe, HPE typically recommends against downgrades unless they are absolutely necessary. How to Downgrade iLO 4 The most common methods for rolling back firmware include: