How To Fix iTunes Error 21 While Restoring iPhone / iPod Touch

Itunes Error 21 is the most typical error customers face while performing a restore on the iPhone. Tool Firmware Improve mode often called DFU mode, this mode allows you to restore your iDevice with an original iOS version or a custom iOS version.

itunes error 21 How To Fix  iTunes Error 21 While Restoring iPhone / iPod Touch

To fix iTunes Error 21 in order to restore your iPhone/iPod touch, connect to your device into DFU mode first to get by following the instructions according to your device, The steps below will help getting into DFU mode in case you do not know how to:

How to Fix iTunes Error 21 While Restoring

  • Connect your device to your PC or Mac via a USB cable and launch iTunes.
  • Hold Home + Power button for 10 seconds.
  • After 10 seconds release the power button off, but keep the Home button pressed until iTunes a little device in recovery mode you find there.
  • Once your device into DFU mode, you see nothing on the screen, only a black image. (See above)

If you successfully performed these steps, iTunes will give you a message that a device was found in Recovery Mode and restore it. Now click on the SHIFT button + Restore in iTunes button, so that iTunes can refer to the iOS firmware to which you are restoring to. If you have followed these steps you should be able to fix iTunes Error 21 while restoring your iPhone / iPod touch. Now you have fixed iTunes error 21, and your iPhone can also be restored to an ipsw customized firmware.

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11 comments

  1. i got a iphone 3g but after a few trys it still gives error 21 in itunes ? what must i do :(

  2. getting error 1602 after doing this method

  3. Yeah, i put it on DFU mode, but then i open itunes, shift+click on restore, select the custom ipsw then itunes prep the iphone for restoring, and when it does that it puts the iphone back into recovery mode and i get the error 21 again…

  4. remove the “74.208.105.171 gs.apple.com” line from your hosts file

  5. john@hotmail.com

    go onto MYCOMPUTER/LOCALDRIVE/WINDOWS/SYSTEM32/DRIVERS/ETC/HOSTS. when you double click hosts open with notepad then follow what iHELP said.

  6. WINDOWS COMPUTERS: HOW TO FIX ITUNES ERROR 1602
    Browse to Start > Programs > Accessories > Notepad.
    Click File > Open.
    Browse to “C:\Windows\System32\Drivers\etc”.
    Select “All Files (*.*)” from the Files of Type drop-down menu.
    Select “hosts” and click “Open”.
    SEARCH FOR THE LINE THAT READS “74.208.151.171 gs.apple.com.” AND DELETE IT.
    Close Notepad. Save when prompted.

  7. this helps me alot. the difference between recovery mode and dfu mode. the 1st picture above shows on my iphone 5 (which i thought the dfu mode) i have the problem (-1) while restoring the firmware. it always stuck on restoring the firmware part. (final part. the loading bar on the phone stuck at 75%) and it comes back to the image 1 above. i’ve tried it multiple times but still didn’t get a luck. but when i tried it on a different computer the error (21) appeared. this error bring me to this page. i’ve tried using the instructions above. it just need a proper timing. here’s a tip: while on the image 1. start pressing home botton and power botton. the device will shut down and turn into a full black screen. when that happened, wait for just a second and a half and then release the power botton. in this part, the itunes should detect your device and you can now restore it properly.

    -i get the error (-1) by trying to downgrade my firmware from 6.1.2 to 6.1.1 directly without a shsh blob back up.
    -windows 7 intel core i7 16GB of Ram
    -iphone 5 16gb version 6.1.2 (10B146) “A1429″

  8. what do you mean “Now you SHIFT + Restore in iTunes button to press togethe“

  9. This seemed to fix my error 21 problem pretty quick…

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