The original (not a dump) bios update file from the manufacturer/OEM(BITECOOL) could be encapsulated and i checked your dump, it contains the AMI v2 protection, SVN and ACM RSA.
What you could try for flashing a mod, is using the Intel FPT tool from the correct ME FW package of your system ME version, to dump again, mod and try to write it.
This of course if the regions can be accessible for writing it back.
FPT doesn’t care what is told to write on the SPI, bad or wrong.