Error 21 Custom Restore 4.2.1
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 iPhone Unlock Unlock iPhone Unlock iPhone 3Gs Unlock iPhone 4 Unlock iPhone 4s Ultrasn0w News IOS Wiki How to 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 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 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 scree
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 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 http://jaxov.com/wiki/how-to-fix-itunes-error-21-when-restoring-custom-ipsw-file/ IPSW made by PwnageTool or Sn0wbreeze requires a full firmware restore using iTunes. 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 http://jaxov.com/2011/03/how-to-fix-itunes-error-21-during-custom-ipsw-restore/ 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 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
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OS X Apple Watch Google Google Services Android Reviews Wearables Web IoT Home Automation Developer Tools Deals More Apps Sprink Turn Off LCD Drive Icon Changer About Us Advertise RPon How to Fix 1604, 1601, 1600, 16xx Error During iOS 4.2.1 Custom IPSW Firmware Restore in iTunes with iREB RC3 By Taimur Asad | February 21st, 2011 iPhone developer iH8sn0w has just released a new version of iREB which is compatible with all iOS 4.2.1 devices. You can use it to bypass 1604, 1603, 1602, 1601, 1600 error in iTunes during custom iOS 4.2.1 firmware restore which has been created using either Sn0wbreeze or PwnageTool. iREB 4.0.x/4.1/4.2.1 [r3] supports the following devices: iPhone 2G/3G/3G[S]/4 iPod Touch 1G/2G/3G/4 iPad Apple TV 2 Here’s how to use it: Step 1: Start iTunes 10.1.2 and put your iOS device into DFU mode. iPhone/iPad/iPod touch: Connect your iOS device with your Computer. Hold Power and Home buttons for 10 seconds. Now release the Power button but continue holding the Home button for 10 more seconds. You device should now be in DFU mode. Apple TV 2G: Connect your Apple TV with your Computer via microUSB. Now reboot your Apple TV by holding down Menu + Down buttons together for around 6 seconds. After reboot, immediately hold Menu + Play until you see the message in iTunes saying that Apple TV in recovery mode is detected. Step 2: Now close iTunes and Start iREB RC3 on Windows. Step 3: Simply select your device and wait for a few seconds until you get white or a red screen on your iOS device. Step 4: Now start iTunes again and select your iOS device from the sidebar in iTunes. Now press and hold left “alt” button (“Shift” button on Windows) on the keyboard and then click on “Restore” (Not “Update”) button in the iTunes and then release the “Shift” button. Select the required custom .ipsw file and restore it. That’s it! iTunes should now be able to restore your iOS device to the latest iOS 4.2.1 custom firmware without any problems. Hopefully you wont get any 16xx errors during restore this time around! Download iTunes 10.1.2 for Windows Download iREB RC3 for Windows You can follow us on Twitter or join our Facebook fanpage to keep yourself updated on all the latest iPhone jailbreaking and unlocking releases.
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