I have an iPhone 4 running ios 6.0. It is jailbroken (tethered) with redsnow. I had downloaded an app from Cydia, as well as the certificate which it required. The certificate changed all my settings. I accidentally deleted the app without deleting the certificate, and it threw me into a recovery loop. I've tried everything I can find, including redsnows recovery fix, tiny umbrella's recovery fix and restoring (via iTunes) will in pwned dfu mode. I was going to try iREB r6, but, to my astonishment, I can no longer go into DFU mode... Any suggestions? I have OSX Lion on a MacBook, and a trial of Parallels with a free copy of Windows 8.