Please follow the below steps to update HP Enclosure.

1. Login to “HP BladeSystem Onboard Administrator“.
2. Click on “Rack Firmware” to view the current firmware version.
3. Click on “Active Onboard Administrator” under “Enclosure Information”.
4. Click on “Firmware Update“.
5. Browse to upload the download the firmware.
6. Click on “Upload“.

Note, updating the active OA in first enclosure will automatically update the standby OA. It will never affect your system.