Yes, it’s amazing how much that ebay board resembles the Discrete system board we were already discussing.
Thanks @chinobino . It’s weird that Dell’s not including that MC in their bios. The closest is the A0671 Rocket Lake-S ES (B0), Rocket Lake-S (B0), but that seems to cover every CPU except either one of yours. Maybe it can be supported, but Dell never sold i9-11900T’s, so they didn’t add that MC to the bios?
I think you’re right, and you’re maybe looking at a split bios. That’s not within my wheelhouse. Since you don’t have a service mode jumper, maybe the best option would be to return the incoming 11900T, and replace it with one picked up by the A0671.
See the attached pic of the microcodes covered by Dell. Instead of struggling, you could pick one of these, and be on your way. In case (the quick info aggregator) AI is wrong, you could narrow it down to a 65W CPU.
Anything to steer clear of having to use a physical programmer in your situation.