11 Jun 2022 12:22
In my opinion that won't work. V4-cores come with AROS-rom that is incompatible with AOS3.9. So, you should first boot to - for example - ApolloOS and flash the rom for OS3.9 using vampireflash from the shell. After that it should work.
Another option is to modify your startup-sequence in OS3.9 to temporarily map the AOS-rom using maprom or vcontrol mr=yourrom.rom.
PD: I am not sure maprom still exists, but vcontrol mr=... should work.