Place the iOS device in Recovery Mode and then connect to your computer and restore via iTunes. The iPod will be erased.
If recovery mode does not work try DFU mode.
Try disabling the computer's antivirus and firewall.
- Next try the manual install method of:
Place the iPod in recovery mode after the firmware download is complete and then restore using the instructions in the article. Sometimes recovery mode timeouts and returns to disabled before the firmware download is complete.
- Then try on another computer