Thanks Xonar for the reply. I did spend whatever time i had in 2 consecutive days to see what I could find anything on google about the IGP, and surprise, no clear mentioning that it might be problematic, just that it's disabled. So a non-paranoid conclusion after this would be that it's fine to unlock it.
When you're eager to test new stuff out, there's hardly any patience to read every page of every forum on the topic. We live and learn
So now i will try a blind flash with no DOS on the stick or cd's, just one single file from the msi website. Will try both the raid and non raid. The cd spins and the hard drive led blinks a while, but it just seems it's not finding what it's looking for.
Will report if i'm successful.