Recently attempted to jailbreak a generation 4 iPod touch with the 4.2.1 update. I used the Redsn0w program to jailbreak the iPod. When the computer and iPod displayed that the jailbreak was finished I attempted to boot the iPod "tethered" as I was told to by Redsn0w. However, it did not work. The device is stuck in what I can only describe as an infinite booting "loop." The device shows the typical booting process. It begins with a mostly black screen and the white loading circle. It's in that state for a few minutes making the booting noise every four or five seconds (Which is very annoying, by the way). After that, it goes to the Apple logo for several seconds, then a split-second bright flash of white. To fix it, I've tried a few different ways of booting the device, jailbreaking it again with Redsn0w, other Redsn0w fixes, and blackra1n. I cannot connect the device to iTunes because it will not read the information or allow me to restore it unless I can type in the password on the iPod, and since it won't boot, that can't be done. Can anybody diagnose and/or fix the problem?