Yeah, I had similar issues when I was first trying to set it all up. Apart from ensuring you are using the exact librarys specified etc, I'm pretty sure you have to use 'setpatch NOROMUPDATE' If your using OS3.9 (and 3.5 possibly?).
There's no real reason to switch off the setpatch rom updates while using the muredox package. Both my A2000 run with the mu package for many, many years now including a full setpatch command with all needed rom updates. No problem. I admit that it might be some work to fine tune the setup - but afterwards you don't have to disclaim from any rom update.
