Error Bad Shim Signature

[StirlingM]

I'm new to linux, and probably using a surface book 1 for my first major use of it wasn't the best idea, but it's what I had lying around. I followed the script, which was crazy helpful considering I couldn't get the instructions on the linux-surface repo to work, but now when I turn on my computer it says:

error: bad shim signature.
error: you need to load the kernel first.

So I go into the advanced options on the Grub menu to manually select the linux-surface kernel and the same errors come up:

error: bad shim signature.
error you need to load the kernel first.
Press any key to continue...
Failed to boot both default and fallback entries.
Press any key to continue....

This happens with the recovery option as well. I load into the generic kernel just fine, but I have no idea what I'm doing wrong. I followed the install video at https://youtu.be/WOVnCdaSKR8 along with everything I could see online. It's not that big of a deal that I can't use most of the surface book features, but I figured I'd give these options a try and now I'm stuck so any help would be appreciated.

Thanks!