What is the file you attached? Stock normally means ‘from vendor’, but this seems to be your initialized dump?
MEA gives an error about the EFS partition:
I’d recommend cleaning/reinitializing ME and emptying NVRam volume in bios region or replacing ME region and NVRAM EFI volume with thecorresponding ME- region and NVRAM EFI- volume from a stock bios (uninitialized / from vendor!). Your variant is an a little older ‘GH5XGx64_NoPD’, code parts are identical to stock.