Display MoreI dont know, sorry :).
I have tried to open this firmware twice already - first in a set-top-box under a depleted Linux, with the help of "fsck.cramfs" tool and then simply using a "7-zip" archiver under Windows OS.
But I haven't tried the third method, which I also mention above, because I don't have a full-fledged Linux - the necessary "binwalk" tool:
ok ,if you have time try:
unpack & repack dreambox image on ubuntu,
put one good boot loader and install again on dm500