Sorry for late reply, Cloudflare was down and I couldn’t access the site before work.
You should read the following thread (if you haven’t already);
[Guide] Unlock Intel Flash Descriptor Read/Write Access Permissions for SPI Servicing
The modifications will work but only after the modified BIOS has been flashed to the motherboard.
You will still need to bypass any currently present locks to flash the modified BIOS.
The guide above mentions some ways to unlock the flash descriptor but using a hardware programmer is usually the easiest.