Solution 4: Turn off Anti-Virus to fix iPhone error 21Ī lot of times the proper functionality of some vital programs may be hampered by the anti-virus as they might be corrupted or be threats. Get the latest version of iTunes and you might be able to fix iTunes Error 21. Updates on all Apple products can be imperative as they help fix bugs. Solution 3: Fix iTunes error 21 by updating iTunes Well, sometimes simply restarting the iTunes, then starting the restore process again can prove enough to fix iTunes Error 21. iTunes Error 21 is a result of the iTunes being blocked. If there's a real problem, this method will be helpless before it, but if the iPhone Error 21 is a temporary glitch, this should take care of it. Solution 2: Restart iTunes to fix iTunes error 21 Please remember to select the option "Retain user's data while flashing". Step 3 Then click Pro Flash, and import the downloaded firmware. Keep holding the Home button till 3uTools detects an iOS device in DFU mode.) Continue holding them for about 4 seconds after the screen becomes blank, and then release the Power button. (Hold the Home button, and then the Power button. Launch 3uTools and Click Flash & JB -> Firmwares to download the iOS firmware to your iDevice. Step 1 Connect your iDevice to the computer with a standard cable. Steps to fix iTunes error 21 with 3uTools One of the biggest concerns you probably have while attempting your restore and trying to fix iPhone Error 21 is whether your data is safe. Solution 1: How to fix iTunes error 21 or iPhone error 21 without losing data? ![]() This may be due to a hardware error, or maybe there is a communication failure between your device and the servers. The most common reason for iTunes Error 21 is that your iTunes is trying to download the restore files (.ipsw) but is unfortunately being blocked from authentication. Recently, we got feedback from some users of 3uTools that they could not solve iTunes error 21, so here, we will show you how to fix that Error 21 easily and effectively.
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