Okay so I managed to get it to work and I've jailbroken it with PSfreedom (i think - it did everything it said on the instructions it would). How do I now install MultiMAN on it so that I can run my backups? do I need to keep my phone plugged in and re-do the process every time or is my ps3 temporarily jailbroken?
EDIT: Got it to work !
thanks to all who helped