Error 21 Iphone 4.2.1
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iPhone 4.2.1 to 5.1.1.....error 21 everytime!!!! 0 I have a jailbroken/unlocked 3gs with new bootrom currently at iOS 4.2.1 and baseband 5.13.04(i just downgraded last week). Trying to update to 5.1.1 using redsn0w 0914b2 custom build 5.1.1 no_bb ipsw, stitching 5.1.1 shsh onto no_bb ipsw, pawned DFU mode, checked the hosts file, turned off anti-virus software and open iTunes to restore..... i've been trying to doing this for past 2 days but still can't get through. Only error 21 poped out everytime! can some one can help me out! iphone3gs 4.2.1 redsn0w 5.1.1 05.13.04 asked 26 Nov '12, 02:49 roger 11●3●3●5 Answers oldestnewestmost voted 0 Verify you have valid SHSH blobs for 5.1.1 for your device's unique ECID. Also make sure to be entering virgin (slide to power off) DFU mode prior to entering pwn'd DFU mode. Make sure that the tool you are using for pwn'd DFU mode matches the tool you used to make your ipsw, do not mix and match. Hope that helps. link answered 26 Nov '12, 02:51 JuergenWest ♦ 12.1k●37●30●47 0 Bite the bullet, as I am... My daughter downloaded an "post to Facebook" app, in order to bypass her NO FACEBOOK punishment. To say the least, I could NOT delete the app. Cydelete would get the icon off, but on restarting the phone, it would return. Looks like some kind of spyware or virus app to me. I didn't trust it. I have done a full restore. I am updating to 6.0, and will do a tethered jailbreak, for now, until an untethered is released. Now, to the iTunes errors...To say the least, I had the following problems: error 21 when restoring from recovery mode Error 1602 when restoring in DFU. The problem is in the host file. This person has a GREAT way to fix it...AND FAST! http://www.jailbreakqa.com/questions/32462/frequently-asked-questions#33273 I doubted this would fix my problems, but it did! Be sure you restart your computer after you COPY AND PASTE THE NEW FILE INTO THE LOCATIJailbreak 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 iPhone Unlock Unlock iPhone Unlock iPhone 3Gs Unlock iPhone 4 Unlock iPhone 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. During the restore process, if you encounter Error 21, it http://www.jailbreakqa.com/questions/129420/iphone-421-to-511error-21-everytime 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 iPhone in recovery mode, it loads iBoot which makes sure http://jaxov.com/2011/03/how-to-fix-itunes-error-21-during-custom-ipsw-restore/ 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 Click here to cancel reply. Leave a message... your details Notify me of followup comments via e-mail. You can also subscribe without commenting. kimani • 10 months, 1 weJailbreak 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 iPhone Unlock Unlock iPhone http://jaxov.com/wiki/how-to-fix-itunes-error-21-when-restoring-custom-ipsw-file/ Unlock iPhone 3Gs Unlock iPhone 4 Unlock iPhone 4s Ultrasn0w News IOS Wiki How to https://www.youtube.com/watch?v=UTx9A-PECAE Fix iTunes Error 21 When Restoring custom IPSW File? Share on Twitter Share on Google+ Share on Facebook Share on LinkedIn Hello Jaxov, need help here. Few days back, I am trying to jailbreak my iPhone 4 on iOS 4.2.1 using Sn0wbreeze 2.5.1, but during the custom firmware restoration process, iTunes throws Error 21. This is a used iPhone 4 and it was error 21 jailbroken on iOS 4.3.1 using PwnageTool but the previous user said he did not encounter this error. What do I need to do to fix this error? My iPhone is dead. Please help, I’m a novice. Thanks in advance.Asked by: Patrick from Jersey City, New Jersey Hello Patrick, iTunes Error 21 occurs during the custom IPSW firmware using the recovery mode instead of the traditional DFU mode or Device Firmware Upgrade mode. So there’s a possibility that you may encounter Error error 21 iphone 21 when you use PwnageTool or Sn0wbreeze jailbreak tools since these tools were used to create custom pre-jailbroken IPSW file, but chances to get error 21 is very low. By the way, are you planning to unlock your iPhone? Why do you have to use Sn0wbreeze or PwnageTool to restore a custom firmware? If you don’t care about unlocking your iPhone from AT&T then you can just jailbreak your iPhone 4 using Redsn0w 0.9.6rc12 on iOS 4.2.1 or Redsn0w 0.9.6Rrc16 on iOS 4.3.3.Anyway, to fix iTunes’ Error 21, you must put your iPhone (iPad or iPod Touch) into DFU mode. If you don’t know how to put your iOS device into DFU mode, then you can follow the step by step guide posted below:Step 1: Connect your iPhone (iPad or iPod Touch) to your Mac or PC via USB cable (USB cable) and then launch iTunes.Step 2: Then hold down the Home and Power button at the same time for 10 seconds.Step 3: Release the Power button after 10 seconds but continue holding the Home button and wait for iTunes to detect your iPhone in recovery mode.Step 4: Once your iPhone (iPad or iPod Touch) is in DFU mode, you should see nothing on its screen. It should be completely blank.That’s it! You can now restore custom IPSW on your iPhone and hopefully this time you will not get iTunes Error 21. 2 comments Click here to
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