Using plsign to generate a sig for rc.sh failed, the phatbox went into its loop.
That means there ARE two keys. Like I said in the other posts, I believe they are these two files:
pkeys2.e
pkeysa.e
Like A543 suggested, im going to try and remove one of these and duplicate the other, so both keys are the same. If I get them the right way round, and sign the system files with plsign, hopefully the phatbox will use the playlist key for the system files.
I guess the sig files for the above key files probably contain references to the filenames so they are gonna need modifying with a hex editor or something like that.
Ill try it tonight and let you guys know what I find.