I managed to install os3.0 beta's 1, 2 and 3, and my UDID is on a developers list, but when I try and upgrade to the beta 5 (as beta 3 has expired now,) I get an error message (-10) about half way through the installation. So now nothing is installed on it, and I have tried just updating to the beta 4, same error message, and I have tried downgrading to os 2.2.1, but get a different error message (i think its 1013or1016), so my iphone is completely unusable, I can't do anything with it! I've tried putting it in DFU mode, but it just WON'T WORK! Sometimes the iphone connects after putting it into DFU mode, but it just restarts and goes back to normal, or I get an error message (can't remember what). Please please please can someone help, I literally can't use my iphone at all and I really need it! Any help would be much appreciated.