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30 Nov 2018 Part 5: Watch The YouTube Video Guide to Fix iTunes Error 21 4. Your Mac or PC experience constant short freezes unexpectedly. Have you ever encountered iPhone Restore Error 21 in the middle of restoring process? Let's check out how you can fix this iTunes error 21 issue. The problem with showing "unknown error 21" in iTunes seems to be a usual Windows .. a bit over a month after my one year warrenty on my iPhone and Apple asking for 180 for fix, The following instructions helped me:. 18 Dec 2018 It will get all the way to 'preparing iPhone for restore'. Then will say second try. And this is your iPhone error 21 fix Windows and Mac solution. 12 Dec 2018 Fix iTunes error 21 or iPhone error 21 through recovery mode. Put your device into DFU Mode. Hold the power button down for 3 seconds. Connect to iTunes. Plug your iPhone into your computer, and access iTunes. Restore iTunes. Open 'Summary' tab in iTunes, then click 'Restore.' 20 Apr 2016 If you've encountered error 21 in iTunes and are looking for a way to fix How to Fix iTunes Error 21 When Restoring or Update iPhone or iPad27 Mar 2012 5 Mar 2012 make sure the iPhone is connected to a power source (though not pertinent restarts forgetting its position in the data transfer causing error 21. In this article, we will show 4 methods that are most likely going to work and fix iTunes error 21 or iPhone error 21 when restoring or updating your iPhone/iPad