I'm 3.1.2 8GG IBen with blackra1n. I wanted to update to 4.0, so I tried restoring on iTunes. At the end it said that my Ipod could not be restored. I downloaded the 4.0 firmware for 2G, and tried Shift Restore. But I'm getting an error 13. Now My iPod's screen is On, but it shows nothing. It's in Recovery mode.