Hi! Just want to aks, if someone knows, how can I solve my problem. After every reboot, my iPone 3Gs iOS 4.2.1 (jailbroken) enters the dfu mode, it does it immediately, when I swich it off. Only the "tethered reboot" in redsn0w helps me. But I think, that it is not the tethered jailbreak, also...