and problem solved, ended up figuring it out
I now have it booting up just fine and have Open Transport 1.1.2 installed, now I can backup the 520 via FTP like the 520c and only need another AAUI transponder so I can do both at the same time, woohoo.
I now have it booting up just fine and have Open Transport 1.1.2 installed, now I can backup the 520 via FTP like the 520c and only need another AAUI transponder so I can do both at the same time, woohoo.