I have an ipod touch 2g FW 3.0 jailbreaked with redsn0w. I believe it was tethered, since when i tried to reboot device after installing winterboard in cydia, it had to rejailbreak. So, accidentally one time i updated mobilesubstrate and clicked Reboot Device without looking if it said Return to Cydia. I got nervous, but the ipod just rebooted and everything was there. Does anyone know why?