Error 21
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Error 21 Itunes
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Jailbreak Developers iPhone Dev Team Saurik MuscleNerd Planetbeing Comex Pod2G P0sixNinja i0n1c iH8Sn0w GeoHot NotCom Jailbreak Guides iPhone Jailbreak Tutorials Jailbreak iPod Touch Jailbreaking Explained Cydia Jailbreak Software Sn0wbreeze Absinthe Blackra1n LimeRa1n JailbreakM Redsn0w Greenpois0n http://jaxov.com/2011/03/how-to-fix-itunes-error-21-during-custom-ipsw-restore/ PwnageTool Seas0nPass iPhone Unlock Unlock iPhone Unlock iPhone 3Gs Unlock iPhone 4 Unlock iPhone http://www.unlockboot.com/2015/12/how-to-fix-itunes-error-21-when-restore.html 4s Ultrasn0w News IOS Wiki Fix iTunes Error 21 During Custom IPSW Restore [How-To Guide]By Ben Johnson last updated June 27, 2014 Share on Twitter Share on Google+ Share on Facebook Share on LinkedIn Jailbreaking your iPhone, iPod Touch or iPod using custom IPSW made by PwnageTool or Sn0wbreeze requires a full firmware restore using iTunes. error 21 During the restore process, if you encounter Error 21, it means that you are trying to restore custom IPSW using the recovery mode. To fix this issue, you must put your iDevice into DFU mode.DFU or Device Firmware Upgrade mode allows all iDevices to be restored from any state. The actual difference between recovery and DFU mode is that when you put your iDevice into DFU mode, it do not loads iBoot automatically. error 21 iphone When you put your iPhone in recovery mode, it loads iBoot which makes sure that the firmware you are trying to restore is greater or equal to the current firmware.To fix iTunes error 21, you must put your iDevice into DFU mode using the following instructions:Connect your iDevice to your PC or Mac via USB cable and launch iTunes.Hold down the Home+Power button for 10 seconds.After 10 seconds, release the Power button but keep holding the Home button until iTunes detect your iPhone in recovery mode.Once your iDevice is in DFU mode, you should see nothing on its screen. It should be completely blank.Even if your iDevice is in DFU mode, iTunes will detect it as a recovery mode device and will display a message as shown in the above screenshot. As soon as you see the above message, restore custom IPSW and hopefully this time you will not get iTunes Error 21.Be Sure to Check Out:Fix iTunes Error 3194 While Restoring iOS 5.1.1 on iPhone, iPod & iPad
Contact Us for News Tips, Corrections and Feedback Related posts How to Fix “This copy of iTunes is corrupted or is not installed correctly. Please reinstall iTunes. (-42037)” How to Enter DFU Mode With Broken Home Button How to Fix iPhone Boot Loop Issue 116 comments Cthe problem often lies within the user's end, but still most Apple fans get an iPhone for the hassle free experience which is less common on Android; and such errors do really hurt the Apple reputation. However, iTunes error 21 often shows up while an iPhone or iPad iOS update is attempted using iTunes. The problems don't have any specific one-button fix, thus users will have to take the hit & miss path to test each and every possible solutions to succeed. Here are seven easy fixes which are most likely going to work and fix iTunes error 21. How to Fix iTunes Unknown Error 21 Below are posted the top 7 methods to fix iTunes error 21 when you restore or update your iPhone: 1. Restart iTunes iTunes isn't very perfect even till yet, it often tends to act very buggy. iTunes error 21 could be a result of a faulty session. There could be other reasons like a disrupted connection between the iPhone and iTunes in midst of the update which resulted into a temporary corruption of update files, potentially leading into unknown error 21. Other similar sort of issues might just arise in a matter of moments. Restarting iTunes is the best possible solution in such cases; as it resets some values and bits underneath to bring things back to normal. 2. Update iTunes Is your iTunes the latest version from Apple? With update in iOS and every other software, iTunes needs to be updated as well. Especially if your iPhone is running the latest iOS and your iTunes is few generations older - many errors like error 21 are very likely to appear every now and then. There are probably a lot of conflicts happening underneath triggering errors. 3. Disable Antivirus for a While Updates require internet access. Though it's very unlikely to happen, yet your security program could list iTunes as a malicious program and block all incoming and outgoing data traffic through this app. As a result, updating iPhone via iTunes will be interrupted. Check your antivirus block list for such case, or simply disable it for a while. 4. Check Host File Check if the .hosts file doesn't block the Apple's servers. To do that you need to open yo