Ok, have this problem on _two_ machines now, so I presume there is a universal fix:
I installed OS3.9 on a new hard drive and put it in my Amiga(s) (the other one an A1200 with Blizzard A1260, the other an A4000 with CSPPC/060). And just to be clear, these are two separate hard drives, not the same one.
Everything more or less worked. I updated to BoingBag 1, everything more or less worked. I updated to BoingBag 2 and installed the ROM update -> all went haywire. The machines keep booting themselves over and over again with slightly different gurus.
If I comment out Setpatch, I get a booting system that is... stuck in the Stone Age. I tried renaming the latest ROM update file to something else, and still no dice. What to do here?
I did install the latest Blizzard libraries from phase5.a1k.org, but are they overwritten when BB2 installs? I have the installers on my larger HD partition, which I cannot access since the pre-Setpatch Miggy only sees the first 1 GB.