OC/BigSur - StartImage Failed

I have a working Clover/Catalina on my laptop and am trying to move over to OC. Ive built my USB key with BigSur and followed the instructions from Dortania for KabyLake and keep getting stuck on the following line, right after I select Install BigSur from OC menu:

OCB: StartImage failed

The laptop is a 2018 HP Spectre x360 Convertible with i7-8550U KabyLake R

All kexts and drivers have been updated to latest and OC is latest version: 0.6.3

Any help would be appreciated.

Thanks

Error log:

https://www.tonymacx86.com/attachments/opencore-2020-11-18-204147-txt.496923/

submitted by /u/zander7990
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