1. Solutions
Following are some other solutions you can try:
a. Restart iTunes
One of the first things you should do when you encounter iTunes errors such as error 21 is close iTunes and launch it again. Sometimes a simple iTunes restart is all you need to fix such issues. It doesn’t take long to restart iTunes and it could solve the problem, so it is definitely worth a try.
b. Update iTunes
If restarting iTunes doesn’t fix the problem, then the next thing you should do is check whether you are using the latest version of iTunes. If you are not using the latest version, then it is recommended that you update iTunes via the Help section. iTunes updates often fix issues such as iTunes error 21.
Follow these instructions:
1. Launch iTunes.
2. Navigate to Help > Check for Updates.
3. If an update is available, then follow the on-screen instructions to update iTunes.
c. Turn Off Your Antivirus
As mentioned above, your antivirus software could cause conflicts with iTunes and prevent it from downloading restore files from Apple’s servers, hence leading to error 21. So, turning off antivirus is recommended as it could solve the problem. Simply launch your antivirus software and follow the on-screen instructions to turn it off.
d. Remove Hosts File
A corrupted Windows Hosts file could prevent iTunes from connecting to Apple’s servers and cause error 21. So, it would be a good idea to remove Hosts file and then try the restore process.
Follow these instructions:
1. On your Windows PC, navigate to C:/Windows/System32/Drivers/etc/hosts and cut and paste the Hosts file to desktop or some other folder.
2. After moving the Hosts file, try to restore your iDevice via iTunes again.
3. Once the restore process is completed successfully, put the Hosts file back to its original location.
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