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Top 4 Ways to Fix iTunes Error 21

November 23, 2016 04:30 pm / Posted by Jenefey Aaron to iTunes Tips
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Most of iDevice users complained that iTunes 21 happens from time to time when they are trying to restore or update the iPhone, iPad or iPod touch using iTunes. If you’ve encountered error 21 in iTunes and are looking for a way to fix it. In this article, we will show 4 methods that are most likely going to work and fix iTunes error 21 when restore or update your iPhone/iPad in iOS 11/10/9/8.

 itunes error 21 fix

Common Causes of iTunes Error 21

Runtime Errors such as “Error 21” can be caused by a variety of factors, so it is important that you troubleshoot each of the possible causes to prevent it from recurring.

How to Fix iTunes Error 21 When Restoring or Updating iPhone, iPad and iPod

There are several things you can try on how to fix itunes error 21. Below will show you 4 out of the most effective ways. Now let’s take a look.

Method 1: Fix iTunes 21 Error with Tenorshare ReiBoot

To fix iTunes error without any data loss, a useful program you can have a try - Tenorshare ReiBoot. It comes to your hand. This powerful tool not only can put your device into Recovery mode within one click , but also help you fix all iPhone stuck problems, now get Tenorshare ReiBoot downloaded and installed on your PC, then let’s get started.

Within the simple 3 steps, your iOS device can be fixed to normal.

Method 2: Use Tenorshare TunesCare

Most of time the problem occurred due to the problem with iTunes. Hence, we suggest you to get your iTunes error fixed first with the help of Tenorshare TunesCare, which is an all-in-one iTunes repair tool to fix all iTunes syncing problems and iTunes errors for free.

Method 3: Disable/Remove Security Software

In some cases, your security software such as antivirus may cause the issue with your computer’s connection with iTunes. To fix the issue, you’d better disable any security and antivirus softwares temporarily or remove them. As for those cannot be uninstalled completely security programs, you will need a cleanup software to help you remove them thoroughly. It’s also a good idea to temporarily disable Firewall to see if it fixes the issue.

Method 4: Check Hosts File

Your host file might be preventing iTunes from contacting Apple’s update server. In such a case, make sure that it is not blocking the communication. This can be done by removing the ‘’ line in the hosts file. Go to Microsoft support site to see how you can check the host file on Windows or if you’re on Mac, follow the steps below:

With these four major methods, you can correct iTunes error code 21 on your own. Still, we recommend you to regularly manage and backup your files, you can also have a try of Tenorshare iCareFone, which is the best iTunes alternative to manage, backup and restore iPhone data.

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