Close × Menu Repair Guides Answers Forum Parts & Tools Store Teardowns Translate Join Log In GO iFixit Fast Order Create a Page Edit Billing Info Order History Logout Join Log In Repair Guides Answers Forum Parts & Tools Store Teardowns Translate « Back to Answers Index 81953 iPhone 4 Repair Fourth generation iPhone. Repair is straightforward, iphone wont restore error 21 but the front glass and LCD must be replaced as a unit. GSM / 8, 16, or
Fix Error 2132 GB capacity / Model A1332 / Black and White. iphone 4 restore fail 3124 Questions View all Clew Rep: 781 2 2 1 Posted: 03/05/2012 error code 21 Options Permalink History Subscribe Unsubscribe iPhone4 won't restore and shows Error 21 My phone won't turn on, but shows the Apple logo when I plug it in (either to the wall charger or the computer). Then, it goes to the Connect to iTunes error 21 iphone 4 screen and when I connect it to iTunes it tells me that I need to restore the phone. It will get all the way to "preparing iPhone for restore" then will say, "The iPhone could not be restored. An unknown error occurred (21)." I tried to disable my computer security, but it did the same thing. Does anyone know what else I could do to fix it? Please help! Answer this question I have this problem too Subscribed to new answers Is this a good question?
Error 11Yes No Voted Undo Score 65 Cancel Comments: my iPhone does the same thing 12/27/2014 by imani I just had this error, I removed screen, changed battery for another one from a spare phone, connected old screen back on, and YES no more error 21, phone restored fine and working without problem. 01/06/2015 by jeffa ps old battery ribbon connection was damaged. 01/06/2015 by jeffa my phone restore, keep getting Error YES no more error 21, phone restored 04/22/2015 by Ankit Gupta i need help mine does the same thing and it gets me so frusturated ive tried everything to restore it but nothing. please help!!! 04/26/2015 by karisma alvarez bro,my phone does the same exsact thing !!! its making me really mad doe 05/04/2015 by zenella garcia It worked but now it won't swip open the screen. 05/16/2015 by Maria Cotto Yes it worked, but now it won't swip open the screen. 05/16/2015 by Maria Cotto its nots working. it keeps doing it. 06/23/2015 by cheyeneham9761 Remove the battery and leave the phone for 2 minutes. Put the battery back, connect the phone to iTunes and restore. It worked for me. I guess the phone needed a complete hard reset. 06/24/2015 by Neo All you need to do is get a new battery :). Hope this solved some problems :) March 19 by SweetCandyCane All you need to do is replace the battery on the phone but either go to a professional or just get a new phone March 19 by SweetCandyCane my battery is br
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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 PwnageTool Seas0nPass http://jaxov.com/2011/03/how-to-fix-itunes-error-21-during-custom-ipsw-restore/ iPhone Unlock Unlock iPhone Unlock iPhone 3Gs Unlock iPhone 4 Unlock iPhone 4s http://www.unlockboot.com/2015/12/how-to-fix-itunes-error-21-when-restore.html 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. During the restore error 21 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. When you put your error 21 iphone 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 & iPadContact 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 Click here to cancel reply. Leave a message... your detai
the 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 your hosts file.