The iTunes error 21 basically occurs due to outdated software. Some of the security software packages might interfere with your restore process. The error also happens when you try to upgrade or restore your iPhone or you find connectivity issues between the device and the server, hardware error. If you are struggling with the same error, go through the procedures given below and fix the glitch.
If you do not know the ways to fix the error, you are in the best place. Go through the methods mentioned below and resolve the glitch instantly.
You can also fix the iTunes error 21 by updating iTunes. Users have reported that often upgrading iTunes resolves the issue. Perform the following steps to improve iTunes.
In most cases, if you have an antivirus, you encounter the iTunes error 21. The antivirus might not be compatible with your device, hence, turning off the software or uninstalling it can fix the problem. To turn off the software you need to open Settings. Then, under the Applications, locate the antivirus that you have in your iPhone and click on the uninstall option or on the Disable option. Now, reboot your phone and check if the glitch persists.
Furthermore, you can also try to fix the iPhone error 21 by removing all the unnecessary external devices from the computer. They may have programs that are getting in the way of proper restoration and thus bringing up the iPhone error 21.
Restarting iTunes is a simple measure that you can look at to fix the problem quickly. If the problem is a temporary one then rebooting iTunes will help you out and resolve the error. However, if the failure is permanent, this method will be useless for you. The process of restarting has helped a lot of the users to fix the iTunes error 21 easily.
If none of the steps mentioned above work for, you have to check the sensor cables. To check them you have to open the device, confiscate the screw which connects the battery and then disconnect the device cable. Now you have to put it back together.
You can also fix the iTunes error code 21 using the Recovery mode. Upon applying this process all the data of your iPhone might not be safe. The following guidelines will help you in the process.
Step 1 – Put your device in DFU Mode.
You have to hold the power button for a few seconds. Repeat the process unless you receive “connect to iTunes screen” message on your screen.
Step 2. Connect to iTunes.
First, plug your iPhone into your computer, and then access iTunes.
Step 3. Restore iTunes.
To restore iTunes, you need to open the Summary tab in iTunes, and then click on the ‘Restore’ option. After the restoration process, your device will restart. When the “Slide to set up” pops up on your screen, follow the Setup.
The iTunes error 21 can also occur due to outdated software. If you are using an earlier version of the application, you are likely to face this issue. Hence, update the software to further work with iTunes smoothly.
Hopefully, the methods mentioned below will solve the iTunes error 21 that you are currently encountering.