I did the same thing, made the 32MB dump starting from address 44000000 from my K508i
I think the files (EROM, MAIN, FS, GDFS) can be extracted through a hex editor or something, it's just that the addresses and sizes are needed.
So, could someone please tell me which are these addresses for the SE K508i phone? Maybe they're the same as for the K500, but I don't know those, too...