![]() ![]() DFU stands for Device Firmware Upgrade and ensures a complete restore of iPhone. This method involves you trying to fix iPhone Error 21 via DFU mode. Solution 7: How to fix iTunes error 21 via recovery mode ![]() Tips: If these steps won't work, probably the iTunes components are corrupted. Once the download is complete, Dr.Fone will automatically start repairing the iOS, except this time you won't be bothered with an iPhone error 21 message! Simply click 'Start' and wait for the process to complete. And if the device is a jailbroken iPhone, then it will be converted back to its none jail-broken state.ĭr.Fone will identify the iPhone model and offer the latest iOS version for you to download. Important: Please note that by fixing the issue - iPhone stuck at Apple logo, the iOS operating system on your iPhone will be updated to the latest version. Click on that.Ĭonnect your iPhone via a cable and let Dr.Fone detect it. Choose 'System Repair'Īfter launching the Dr.Fone toolkit, you'll find 'System Repair'. Steps to fix iTunes error 21 with Dr.Fone Step 1. Solution 8: Check modified or outdated software.Solution 7: How to fix iTunes error 21 via recovery mode.Solution 5: Remove unnecessary USB devices.Solution 4: Turn off Anti-Virus to fix iPhone error 21.Solution 3: Fix iTunes error 21 by updating iTunes.Solution 2: Repair iTunes to fix iTunes error 21.Solution 1: How to fix iTunes error 21 or iPhone error 21 without losing data.What is iTunes Error 21 (iPhone Error 21)?.So here we're showing you 8 different ways by which you can fix iTunes error 21 or iPhone Error 21, restore with ease, and continue using your device! Generally, these errors are a result of some security software package interfering with your restore, and it usually has an easy fix. It might have happened to you that you're trying to restore your iPhone but no matter what you do, iPhone won't restore because an iTunes error 21 or iPhone Error 21 keeps popping up! It's like a whack-a-mole, you keep trying to restore, but that infernal iPhone Error 21 comes again. ![]()
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