How to Fix Error -1 & Error 1 in iTunes/iPhoneGuide?

 Previously iPhoneGuide released a post “iPhone iPad iPod iTunes Errors with Solutions”, which we have introduced some Error Codes in iTunes simply, and you can view this post with more detailed solutions for Apple iPhone, iPad, iPod Touch with iTunes errors. 

iPhoneGuide received many users' required, today we made a tutorial about fixing error -1/1  when you restore or upgrade in iTunes/iPhoneGuide for you :

Error 1 or -1

This may indicate a hardware issue with your device. Follow Trouble shooting security software issues, and restore your device on a different known-good computer. If the errors persist on another computer, the device may need service.

This device is not eligible for the requested build  (Also sometimes displayed as an "error 3194").

The most useful tip is : 

unplug and replug your iPhone;and  try to use the back USB port.

Then, if the issue still exists after your try several times, it could be a baseband issue.

Or maybe it caused by following reasons:

1.Update to the latest version of iTunes.

2.Third-party security software or router security settings can also cause this issue. 

3.Downgrading to a previous version of iOS is not supported. If you have installed software to perform unauthorized modifications to your iOS device, that software may have redirected connections to the update server (gs.apple.com) within the Hosts file. Uninstall the unauthorized modification software from the computer.

4.Edit out the "gs.apple.com" redirect from your hosts file, and then restart the computer for the host file changes to take affect.( For steps to edit the Hosts file)

5.Avoid using an older or modified .ipsw file. Try moving the current .ipsw file (see Advanced Steps > Rename, move, or delete the iOS software file (.ipsw) below for file locations), or try restoring in a new user to ensure that iTunes downloads a new .ipsw.


Check for hardware issues if you meet these Error Codes:

 If you see one of the errors below, you might have a hardware issue:

1, 3, 10, 11, 12, 13, 14, 16
20, 21, 23, 26, 27, 28, 29, 34, 35, 36, 37, 40, 56
1002, 1004, 1011, 1012, 1014, 1667 1669

Here's what to check:

If iTunes is already open, quit and reopen it.

Make sure that you have the latest version of iTunes.

Check for issues with third-party security software.

Make sure that your USB cable, computer, and network are reliable. Then try twice more to restore your iPhone, iPad, or iPod.

If you still see the error message, you can check for outdated or modified software or contact Apple Support.

Recently, iPhoneGuide made a series of "How to fix error code" tutorials on 3u official website, 


You could check here directly for more error codes roundup in iPhoneGuide/iTunes.