[Request] 9900K (906ED) support on iMac EMC 2834

[TheSynthax]

Hello, I have an old-ish iMac and a 9900K laying around I'm experimenting with. I'm attempting a CoffeeLake mod on its EFI. So far I've downgraded the ME firmware in the bios I dumped by grabbing an older firmware for this machine and extracting the ME FW from that. I've inserted the microcode for my SRG19 version of the 9900K (906ED mcode) which I've pulled out of the 2019 iMac's firmware. I seem to be running into an issue with a checksum in the Volume Top File, or so I believe. Editing the pad file which contains the microcode on these machines causes an error in UEFITool when loading the modified firmware

"FfsParser::findFitRecursive: FIT table candidate found, but not referenced from the last VTF"

I suspected this could possibly be due to moving the position of the FIT table in the microcode file at first, but leaving it at the same address results in the same issue and a non-booting system, leading me to believe this to be a checksum problem. The firmware very well may need further modifications to play nice with the drastically newer CPU, but that's why this is just an experimental project. Here's the files I'm working with https://www.dropbox.com/sh/0wtomvxujwijc...dmk7a?dl=0
  iMac2015dmp.bin (Size: 8 MB / Downloads: 2)

[DeathBringer]

This firmware has support for Skylake only. So adding microcode doesn't add support for new CPU.

[TheSynthax]

This firmware has support for Skylake only. So adding microcode doesn't add support for new CPU.

Thank you for your reply. What makes this different from the many other Skylake boards that can be firmware modded to support Coffeelake? The complexity of the patches required?

[DeathBringer]

What makes this different from the many other Skylake boards that can be firmware modded to support Coffeelake?

Only firmwares with native support of Kaby Lake are suitable to add support of Coffee Lake.

[TheSynthax]

What makes this different from the many other Skylake boards that can be firmware modded to support Coffeelake?

Only firmwares with native support of Kaby Lake are suitable to add support of Coffee Lake.

Hmm. So a 2017 *might* be possible to add support to? They come with Kabylake.

[DeathBringer]

So a 2017 *might* be possible to add support to? They come with Kabylake.

I haven't proper dump for it.

[TheSynthax]

So a 2017 *might* be possible to add support to? They come with Kabylake.

I haven't proper dump for it.

Ah, my bad, here's one. 
  iMac 2017.bin (Size: 8 MB / Downloads: 1)

[DeathBringer]

Try to use CoffeeTime for this firmware.

[TheSynthax]

Try to use CoffeeTime for this firmware.

CoffeeTime REALLY did not like the 2015 firmware, I'll try 2017's

Edit: CoffeeTime gives the same errors on 2017, can't detect microcode and "Can not rebuilt FIT table!"