By 2.04 roms I take it you have an A600, A500, A2000 or A3000. Use SKick and you can boot fine into 3.1 (even seems to allow you to use games that normally break on 3.1 roms, like DungeonMasterHD). You need to copy the 3.1 ROM image and install it in Devs:kickstarts/ along with the .rtb and .pat files used by SKick. There are instructions with SKick that instruct you to use a program supplied with MKick to make the .rtb and .pat files from your 3.1 ROM image (I forget the exact name). Then just place SKick in s: and type in s:startup-sequence before the command c:Setpatch the following line c:SKick devs:kickstarts/kick40063 nopatch quiet. I found using the .pat file causes a guru on my A2000, thus the nopatch command.
