after the 3.1 installation i put in the 3.9 cd, check "add dvd/cd drives" in winuae and reset. then i am asked if i would like to do the upgrade. i click yes, see 50% 100% ... bugfixes - END - RESET - BROKEN OS as seen above...
tried to add the cd-drive as a hard drive device "cd0" as well, same result.
all in winuae
the last try was to do it on my sx32-pro equipped cd32 for real and the cd is not recognized, but i guess that has to do with the cd32-cd-rom driver..