Apple does not support downgrading an iOS. You will get error messages if you try.
For error 14:
Error 13 and 14: These errors are typically resolved by performing one or more of the steps listed below:
- Perform USB isolation troubleshooting, including trying a different USB port directly on the computer. See the advanced steps below for USB troubleshooting.
- Put a USB 2.0 hub between the device and the computer.
- Try a different USB 30-pin dock-connector cable.
- Eliminate third-party security software conflicts.
- There may be third-party software installed that modifies your default packet size in Windows by inserting one or more TcpWindowSize entries into your registry. Your default packet size being set incorrectly can cause this error. Contact the manufacturer of the software that installed the packet-size modification for assistance. Or, follow this article by Microsoft: How to reset Internet Protocol (TCP/IP) to reset the packet size back to the default for Windows.
- Connect your computer directly to your Internet source, bypassing any routers, hubs, or switches. You may need to restart your computer and modem to get online.
- Try to restore from another known-good computer and network.
Downgrades are not supported? Wonderful!
I have tried all the USB ports on my computer. They are all 2.0, and I don't have a 2.0 hub to try.
I only have the one 30 pin connector, the one that came with the iPod.
I have disabled all my virus scanning/firewall software. There is nothing else running except iTunes and the basic Windows services that I cannot disable.
I will try to reset TCP/IP when I get home tonight.
Restoring from another computer... this iPod is only registered to this one computer. Will that affect my ability to re-sync my music from iTunes to this iPod if I restore it on another machine?
Well, I have tried everything on the list and it's still bricked.
I even uninstalled iTunes, cleaned the registry and reinstalled - no luck. Then, being stupid, I decided to try and update my iPad... now it's bricked as well with error 1603/1604.
This is f***king absurd! I can understand having problems if I'd made some crazy mods to my hardware or something, but these are stock iPod/iPad devices (no jailbreaking). There has got to be some way to restore these, surely!