@Lost_N_BIOS I think I'm ready to try and prepare Ultimate 1003 for P8H61-MX USB3
I've prepped the Vbios, the GOPs and LAN ROM come from UBU, not sure if there's a more appropriate RAID EFI IRST to add than 11.5.0.1582 - I won't be doing RAID (does H61 even have RAID)
Got the other tool to switch that setting
UBU to update to latest

Can't seem to find an emergency BIOS repair if it goes wrong though, my old system had "crashfree" or whatever it was called, on a scale of 1-10, risky or nothing to worry about?.
Found 2143 as the version, 2143.bsf from the original, put it out to transfer.ssf, 2171.dat & bsf and then imported, saved (it calls the .DAT a BMP document - is that right - it's 64k like the original file)

Sorry @Matth79 - I am unsure what all that is saying Your final comment "It calls some .dat a .bmp file" Is not the program itself, you can control/change/select file extensions when you save things, if something was saved with incorrect extension, or you are not sure, do it over again or rename to what you know it should be.
Size of file is not important, well it is, but you can't assume since two things are 64k all is well. You need to be sure it's correct files, correctly generated, correctly replaced, and that they start the same in hex (with header or without etc)

You're correct, there is no RAID For H61, but I didn't check the board specs or BIOS again, there may be other controller doing RAID but it wouldn't use the Intel orom.

Emergency BIOS repair is CH341A + U type Flat CHIP IC puller / extractor (Or, if BIOS is soldered to the board, then you need SOIC8 test clip cable instead)

@Lost_N_BIOS UBU got all the things in ok, AMIBCP changed setting to User, flashed it and it seemed to do the right twiddling.

Multicore enhancement didn't appear.

Couldn't find any way to id if it has actually gone in though, couldn't find any way to report any of the versions that were updated, tried turning ROM messages on.

I'm guessing that maybe Multicore enhance might not be possible with the current microcode, as I saw some other things asking for older microcode - and if it's a choice between latest microcode and an extra 200MHz all core, then I'll take the latest

@Matth79 - Seeing this in BIOS does not matter what microcode you have, it will show on microcode that don't work too, once you make it visible

Did you set Multicore enhancement to User? If yes, try Supervisor instead. If that fails, you need to unsuppress it by editing the setup module using IFR output and hex.
Edit this, right before the setting
Suppress If {0A 82}
True {46 02} << Change the 46 to 47 in hex editor

If you need me to do that for you, upload your latest BIOS mod and I will send you few BIOS to try (all with this unsupressed, but additional BCP edits after that too, might need only the setup mod done or both that and BCP after too)

Did those changes (supervisor, & the 46 to 47), flashed, still not visible, tried GPU-Z but reported unknown for the BIOS of the HD4000 - maybe it can't get because it wasn't active, Still cannot find any way to prove the flash took, as I seem to recall that the flash method might not actually do it.
BIOS as I set it, also did the VBIOS, the GOP and the LAN just for completeness, as well as the microcode