I'm trying to jailbreak my iPhone 3G (2.2.1) using QuickPwn on Mac OS X 10.5.6. I get past activating dfu mode, but then the program stalls out and the status bar on the following screen doesn't even flinch. Anyone know what's going on or how to fix it? I can still get my iPhone OS to work normally after restarting (not restoring) it, but I'd like to jailbreak it.