338-HP RESTful API Error
338-HP RESTful API Error – Unable to communicate with iLO FW. BIOS configuration resources may not be up-to-date.
The iLO RESTful API returned an HTTP Error Status other than 200-OK or 201-Created for a BIOS POST request to register or refresh the BIOS REST provider.
Restore Manufacturing Defaults in RBSU.
For more information, see "UEFI System Utilities" in the HPE ProLiant Gen9 Troubleshooting Guide, Volume I on the Hewlett Packard Enterprise website.