We're attempting to downgrade BIOS on PowerEdge R630 to 1.5.4 due to conflict/known issue with PRI card (Sangoma model A102).  (Note that we successfully downgraded a PowerEdge R730 from 2.13 to 1.5.4 using the ".efi" file process - F11 Boot Manager => System Utilities => BIOS Update File Explorer). 

When trying to do the same on R630, the update utility displays the current version (2.0.1) and the new version (1.5.4). I click on the "Continue BIOS Update" and get the following error:

"BIOS Update Failed ......... This BIOS is not a compatible BIOS type."

I was able to downgrade the R630 to 2.0.1 but any attempts to go below 2.x.x fail with the error above.

Any thoughts?

 

P.S. I am new to the Dell server arena, so please feel free to respond accordingly.