Fix iTunes Error 3

Solutions

Following are some other solutions you can try:
a.Restart iTunes

A simple restart of iTunes will probably fix the issue as some users had success with it. It is recommended that you close iTunes, unplug your iDevice from your computer and then plug it back in, and after that reopen iTunes and try to restore your iDevice. It is likely that the error 3 will not occur after these steps. If the problem persists, then it is recommended that you restart both your computer and your iDevice and then repeat the above-mentioned steps.
b.Try Another USB Cable

Make sure that your USB cable is properly working. It would be a good idea to try another USB cable to connect your iDevice to your computer and then try the restore process. If the problem persists, then it is recommended that you try different USB ports of your computer when plugging in your iDevice.
c.Update iTunes

iTunes updates bring various bug fixes and new features. It is likely that the problem will be solved after you update iTunes to the latest version. Updating iTunes is quite easy so it is definitely worth a try.

Follow these instructions to update iTunes:

1. Launch iTunes on your computer.

2. Navigate to Help > Check for Updates section.

3. Now iTunes will check for available updates. If an update is found, then follow the on-screen instructions to update iTunes to the latest version.
d.Disable Antivirus Software

Sometimes antivirus and security softwares conflict with iTunes and prevent it from communicating with Apple update servers. So, it would be a good idea to temporarily disable the antivirus or any other security software before attempting to restore your iDevice via iTunes. You can re-enable them once your iDevice is successfully restored.

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