Dr.Fone - System Repair
Sep 30, 2024 • Filed to: Mobile Repair Solutions • Proven solutions
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 whack-a-mole, you keep trying to restore, but that infernal iPhone Error 21 comes again. Generally, these errors are a result of some security software package interfering with your restore, and it usually has an easy fix.
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!
Now before we get to the nitty-gritty's of how to fix iTunes Error 21, I'm sure you must be wondering what is iTunes Error 21 (iPhone Error 21) to begin with, and why it has this strange obsession with your phone! 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. This may be due to a hardware error, or maybe there is a communication failure between your device and the servers. When it comes to iTunes Error 21 (iPhone Error 21), the most common causes include:
These factors represent the most common and significant causes when encountering iTunes Error 21. Understanding these causes can help you address the issue more effectively. Fret not! The following part will show you how to fix that iPhone Error 21 easily and effectively and get back to leading your iPhone-engrossed lives!
One of the biggest concerns you probably have while attempting your restore and trying to fix the iPhone Error 21 is whether your data is safe. That is a legitimate concern as a lot of techniques out there might or most certainly will lead to data loss. That is why we're starting our list with a technique that can ensure there won't be any data loss. To ensure this you can use an easy-to-use and convenient software called Dr.Fone - System Repair (iOS)
Your memories and data are all precious and you shouldn't risk them. Dr.Fone seems to place great emphasis on data preservation and as such is the recommended means to fix iPhone Error 21. Furthermore, its convenience and mile-purpose nature help as well.
Fix iTunes error 21 or iPhone error 21 without Data Loss
After launching the Dr.Fone toolkit, you'll find 'System Repair'. Click on that.
Connect your iPhone via a cable and let Dr.Fone detect it. Click 'iPhone' > 'iOS Repair' > 'Standard Repair' to go on with the process.
Important: Please note that by fixing the issue - iPhone stuck at the Apple logo, the iOS operating system on your iPhone will be updated to the latest version. And if the device is a jailbroken iPhone, then it will be converted back to its none jail-broken state.
Put your iPhone into recovery mode, Dr.Fone will identify the iPhone model and offer the latest iOS version for you to download. Simply click 'Download' and wait for the process to complete.
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!
Tips: If these steps won't work, probably the iTunes components are corrupted. Go to repair your iTunes and try again.
If there's a real problem like iTunes error 21, having iTunes components repaired will be effective. No matter whether the iPhone Error 21 is a temporary glitch or a component corruption issue, with the following iTunes repair tool, you can take care of it easily.
Do you remember how I mentioned that the iTunes Error 21 may be a result of iTunes being blocked? Well, sometimes simply repairing iTunes can prove enough to fix iTunes Error 21. So you might wanna' lead with that.
Fix iTunes error 21 with a few clicks. Easy & fast.
Operate based on the following steps. Then you can fix iTunes error 21 quickly:
Step 1. Download the Dr.Fone toolkit. Then install, start it up, and click "System Repair" in the main menu.
Step 2. In the new window, click "iPhone" > "iTunes Repair". Then connect the iOS device to your PC.
Ensure that you're using a genuine Apple USB cable and that it's properly connected to both the computer and the iPhone. Also, try using a different USB port on your computer.
Updates on all Apple products can be imperative as they help fix bugs and whatnot. So if you have been holding out on updating iPhone because you have a slow net, or because your phone is jailbroken, or whatever reason you might have, now is the time to update it. Get the latest version of iTunes and you might be able to fix iTunes Error 21.
On Windows:
On macOS:
A 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. In that case, turning off the Anti-Virus helps access those programs regardless and maybe update your device.
You could try and fix iPhone Error 21 by removing all unnecessary external devices from the computer as they may have programs that are getting in the way of a proper restore and bringing up iPhone Error 21.
This method sounds either complicated or risky. However, it's, not unless you do it exactly as it's supposed to be done. It's sorta' like defusing a bomb, cut the wrong wire and your device goes boom! Well, not literally, but you get the picture. However, if you do it right, you might be able to fix iPhone Error 21. All you have to do is open the device, and confiscate the screw which connects the battery. Disconnect the device cable and put it back together. This might help, though it seems like quite an extreme and risky measure, especially considering you have a far more guaranteed and viable option in Dr.Fone from Solution 1.
This method involves you trying to fix iPhone Error 21 via DFU mode. DFU stands for Device Firmware Upgrade and ensures a complete restore of the iPhone. While this does guarantee to fix iPhone Error 21, it does not guarantee that all your data will be safe. So only use this method if you've exhausted all other options. Here's how you can do it.
Plug your iPhone into your computer, and access iTunes.
When your device is in DFU mode, you will see the following pop-up message.
This solution is likely to fix iPhone Error 21, however, as I mentioned earlier it restores your phone to factory settings without giving you a chance to create a backup. This would lead to considerable data loss, as opposed to the alternative of Dr.Fone.
The iTunes Error 21 might be caused because of outdated or corrupt software. You might be using an old version of iTunes in which case you should refer back to Solution 3 and update it. You might be attempting to install an older version of iOS, in which case you should find the latest version and install that.
In listing out the different methods by which you could fix iPhone Error 21, we haven't discriminated between the different methods. We believe you should have the ultimate power of decision so we've listed them all, along with their pros, cons, and risks. For example, some of the techniques are considered risky and can lead to severe data loss, some may even ruin your iPhone if not handled well, and most of them don't offer any guarantee of success. That is why my recommendation is to go with Dr.Fone - System Repair (iOS) as it is a safeguard against all the risks I just mentioned. But, hey, the choice is in your hands! We just hope you make the right call, and then do common down below to let us know which method worked best for you!
staff Editor
Generally rated4.5(105participated)