Unknown error while updating ipod
Error 48 (or -48): Quit i Tunes and discard the file. See the steps under the heading “Rename, move, or delete the i OS software file (.ipsw)” below for file locations.Error 50: This error (and error -50) are timeout errors. Error 1000: If this error appears in the i Phone, i Pad, or i Pod updater log file, there has been an error decompressing and transferring the IPSW file that is downloaded by i Tunes when restoring your device.
This error can occur when you attempt to update an i Phone 3G to a later version of the software and i Tunes attempts to back up i Phone while it is syncing.
You will need to use a tool like independence (MAC) or jailbreak 1.1.2 (PC) to boot the phone out of recovery mode then your downgrade should be completed.
If your phone says “needs repair” and you tried to restore and got this error, you probably have a permanently damaged phone.
This can occur if the device is manually disconnected during the restore process.
This issue can be resolved by performing USB isolation troubleshooting, using a different USB dock-connector cable, trying another USB port, restoring on another computer, or by eliminating conflicts from third-party security software.