Great, thank you so much! I had assumed that it wouldn't work (surely a checksum would fail if I had the wrong version of the files), but it ended up being a very easy fix
I have this
I have a similar problem (Also bzfirmware checksum error), but I was running 6.12.2, which is no longer on the downloads page. Is there any other place to get older releases? I've looked but all I can find are the blog posts for the old releases and not the .zip files themselves.