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How to Fix iTunes Error When Restoring or Updating iPhone

“When I try to restore my old iTunes backup, iTunes pops up the error said ‘The iPhone could not be restored. An unknown error occurred (3194).’ Why did it appear? How can I solve this problem?”

When you are trying to restore or update iPhone from iTunes backup, you may get the error messages “The iPhone could not be restored. An unknown error occurred (3194).” When you suffer from the trouble, you may turn to Apple for support. However, Apple’s support page for specific errors on iTunes isn’t all that helpful. In this guide, we aim to give you the solution of iTunes error 3194, 17, 1639, 3000-3020, 3100-3999, this device isn’t eligible for the requested build.

How to Fix iTunes Error when Restoring or Updating

Once you having the problem of iTunes error, you could try to install the latest version of iTunes and try to update or restore again. If this doesn’t help, it’s because of a simple problem with the hosts file, follow the steps below to fix.

Step 1. Make sure that iTunes is stopped on your computer (Widows/Mac).

Step 2. Open host files on your computer:

a. For Windows users: c:\windows\system32\drivers\etc\hosts

b. For Mac users: /ect/hosts

Step 3. Open hosts file with administrator rights.
Step 4. Copy " gs.apple.com" into the last line of the "Host" file.Then, "Save" the file.
Step 5. Connect iPhone to PC via USB cable and open iTunes.

Step 6. Press on "Power" button for 10 seconds to turn off your iPhone.

Step 7. Put the iPhone/iPad/iPod into DFU mode by turning the phone off and then holding down the Home and Power button for 10 seconds, then release the Power button but hold onto the Home button until iTunes tells you that the device is now in recovery mode.
Step 8. In recovery mode, you can restore iPhone. Hoever, restore iPhone will erase all data on your iPhone, so make sure you've ever backed up iPhone with iTunes or iCloud.

Step 9. Once your iOS update is finished, go back to the hosts file and remove the " gs.apple.com" line again so that iTunes can properly update as usual. This is an essential step otherwise you may encounter future errors when trying to update or install iOS versions.
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