There is a different rom in the rebranded (SONICblue sticker) receivers. The *only* difference is the logo shown on the screen and the uuid in the NFS server location broadcast; this is to allow it to only boot from updated servers which will serve them a second kernel that doesn't show "Dell" either.

If you've fixed the uuid and are still having problems, I suspect it's not the unit. There's no point upgrading older units as it doesn't actually add anything new.

Hugo