To do it yourself you’ll need a copy of the binary file that is flashed to the SPI chip. If you can obtain this file then you can use me_cleaner.
Sometimes you can get the file out of an executable the manufacturer distributes with BIOS updates, but not always.
Sometimes you can dump it to a file successfully using flashrom or some other software tool which is non-invasive, but definitely want to make sure you got a good dump of it.
Other times you might need to use a SOIC-8 clip and programmer such as a bus pirate to pull it off the SPI manually if you can with flashrom, but pulling the contents of the SPI in-board doesn’t always work so well.
Any way it goes, first step is to obtain the BIOS binary. It should be the same exact size as the SPI chip in your computer.
Once you have that, then you can use:
To try to remove it either by setting the HAP bit or by removing it entirely and then flashing your modified BIOS file to the motherboard by some means.
Usually the least invasive is preferred, so if you can just use the OEM flash process to flash your modified file then you’re in luck.
Or if flashrom is working for you you could use that.