I had a tethered jailbreak made with blackra1n on my iPod Touch 3g 3.1.1 and everything was alright but yesterday it suddenly reboot. Then I tried to turn it on and jailbreak as i did many times but after 10 seconds of showing geohot's picture it reboot again. Then I tried to restore it to 3.1.3 but when a white apple with preloader appeared it suddenly turned off and itunes said "An unknown error occurred (9)". I tried to restore in DFU, on other computer but nothing works. Do you have any idea how to fix this?