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Follow the steps to uninstall iTunes: a. Press Windows key + X and click Control Panel. b. Click on Programs and Features. c. Select iTunes and click Uninstall. d. Restart the computer.
How to Fix iTunes Error 21 While Restoring. 1  Connect your device to your PC or Mac via a USB cable and launch iTunes. 2  Hold Home + Power button for 10 seconds. 3  After 10 seconds release the power button off, but keep the Home button pressed until iTunes a little device in recovery mode you find there.osted By: ihelpounge Staff on: January 22, 2012 11 Comments. Itunes Error 21 is the most typical error customers face while performing a restore on the iPhone. Tool Firmware Improve mode often called DFU mode, this mode allows you to restore your iDevice with an original iOS version or a custom iOS version.