UHD 630 IGPU Firmware error

Hi - new clean install of Big Sur going on:Opencore 0.6.7 - I've gone through the configuration guide for Coffee Lake, and manually setup config.plist. I've used the prebuilt SSDTs, and Kexts as shown below.

(I've been successfully running Catalina on a clover boot for about a year and a half on the same hardware)

I've fixed the first page fault kernel panic based on the trouble shooting information in the open core guide, under kernel issues, and can now boot into Big Sur.

However During boot, I get the following error which repeats something like 50 to 60 times (significantly slowing boot) and then starts Big Sur, but I don't get graphics acceleration:

[IGPU] Hash data from ME never returned, status = 1, doing retry #n
[IGPU] Begin Gfx firmware load process
[IGPU] ForceWake Multithread = 0x30002
[IGPU] CONFIG0 (0xD00) = 0x80000000
[IGPU] GT_THREAD_STATUS = 0x400b0000
[IGPU] Doing retry #n

Hardware:
ASUS PRIME Z370
Intel Core i7-8700K
16 GB Ram
Samsung 970 EVO 1 TB PCIe NVMe M.2
BCM94360CS2 wireless

SSDTs
SSDT-AWAC
SSDT-EC-USBX-DESKTO
PSSDT-PLUG-DRTNIA

Kexts
Apple ALC - 1.5.9
IntelMausi 1.0.5
Lilu 1.5.1
VirtualSMC 1.2.1
WhateverGreen-1.4.9 (Just noticed that has DevBuild in the zip filename if that is an issue)

Config.plist attached - or will be when I can find out how to attach it.Thanks for any help

Here it is

https://pastebin.com/QeBX9U5v

submitted by /u/myblindcat
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