Thanks to @stefann, I’ve fixed the issue that was causing the hash to not match .
You should re-download the script now and re-run it, and it should work this time. If you still have issues, let me know!
 the problem was SeaBIOS itself, the coreboot config stated to build the latest git master of SeaBIOS but of course, there were new commits in git in the past few days, which made the hash different. I’ve now changed the config to tell it to build a specific version of SeaBIOS and that should fix it.
EDIT: I’ve just added a new option to let you neutralize the ME. I’d appreciate it if some of you could test it and see if there are any side effects that you can notice. The biggest one I want to test for is whether you have any reboot or power off issues when you run the neutralized ME.
If you have issues, and want to restore the ME to a normal state, then flash the coreboot-l13v2.rom or coreboot-l15v3.rom image.