Download the USB package, and then edit the IMAGEFH.rom, may or may not be same you mentioned (File size is 6.50MB)
Removing whitelist is done via assembly/disassembly app and hex editor, here is general info about that (not specific to this BIOS, BIOS type, or any BIOS really, just "in general")
https://www.bios-mods.com/forum/Thread-G...nsyde-BIOS
Is the error you are looking for the exact one you are shown? I don't find it either, using UEFITool or extracting setup and several other modules and checking those as well. Makes me think maybe you have wrong error terms? I even looked just Unauthorized network and could not find that either.
Found it! Use UEFITool, via search go to GUID CEC0D748-7232-413B-BDC6-2ED84F5338BC and extract PE32 as is, and the submodule with bunch of zero's on the end. The one with all the zero's holds the text for the error, the PE32 module is where your block coding will need to be edited
I find three instances of Test al, al in assembly that lead to infinite loops, so not sure which applies to your hardware issue, you'd have to test bypassing each one at a time.