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Thread: iTunes Error Code 21

  1. #1
    Default iTunes Error Code 21
    Im trying to restore my iPhone 4 back to the iOS 5.0.1 downloaded iPSW from here at modmyi.com however im getting the Error code 21. THe iOS its running right now is jailbroken. I tried DFU but it gave me error code 1600 any ideas on how to resolve the error code?

  2. #2
    Super Moderator iYeow's Avatar
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    Describe the process of your update to 5.0.1. You should be restoring from Homescreen or recovery mode.

  3. #3
    Connected iPhone while its on to Macbook
    Downloaded the IPSW from Modmyi.com (iPhone 5.0.1 9A405)
    Clicked Option + Restore and selected the IPSW
    iTunes extracts the IPSW Software
    Itunes Verifies the IPSW with Apple
    ITunes prepares iPhone for restore (Recovery Mode)
    iTunes reports unknown Error code 21

  4. #4
    Super Moderator iYeow's Avatar
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    Have you checked your hosts file is not pointed towards cydia ?

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  6. #6
    Super Moderator iYeow's Avatar
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    Do you have tiny umbrella installed ?

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  8. #8
    Super Moderator iYeow's Avatar
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    Go to advance tab in TU and uncheck : set hosts file to cydia and close TU. This is to make sure you are letting apple verify your restore.

  9. #9
    Ok so I went to TU and unchecked the box. Closed TU connected the iPhone again to iTunes and did the whole process but I still got error code 21. I went back to TU and the box was still unchecked

  10. #10
    Super Moderator iYeow's Avatar
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    Did you close itunes and reopen it or do a reboot to see if it works.

  11. #11
    Ok so I closed down iTunes and reopened it as well as rebooted the iPhone and tried to restore it and still got the error code 21.
    \

  12. #12
    Super Moderator iYeow's Avatar
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    Try it on a pc if you have one.

  13. #13
    Should I also just try using the stock restore IPSW iTunes offers or should I just keep choosing the IPSW I downloaded from Modmyi?

  14. #14
    Super Moderator iYeow's Avatar
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    Redownload your stock ipsw from any source like apple or iclarified firmware. Do you have the latest 10.5 itunes installed ?

  15. The Following User Says Thank You to iYeow For This Useful Post:

    SK4DJ (01-04-2012)

  16. #15
    Lol ok, so here's what just happened. I tried it once again and it gave me Error Code 21. However, I always noticed how iTunes left my iPhone on Recovery mode and every time iTune would leave it like that I would use TU to kick it out of Recovery Mode. So after another attempt that iTunes left me with error code 21 and the iPhone in Recovery Mode I decided not to use TU to kick it out of Recovery Mode and just disconnected and reconnected the iPhone back in. iTunes identified the iPhone in recovery mode and I did the restore again, this time it worked (and I had also left "SHSH Cydia" option unchecked, even though at first it still gave me the 21 error code before I tried it agan and it worked with iPhone in Recovery Mode). I could have sworn that I had already tried restoring the iPhone while it was in recovery mode by doing the same process and still giving me the error code 21, but then again I am really tired and tried so many times that everything is a blur right now lol but I guess thats the way to by pass error code 21? lol

    Thanks a lot for staying along and helping me brainstorm a bit iYeow

    I guess the question now is should I jailbreak now and then Restore to the old backup?
    Last edited by SK4DJ; 01-04-2012 at 02:37 AM.

  17. #16
    Super Moderator iYeow's Avatar
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    Setting as a new iphone is recommended although backup restore will work too. Glad you are got it working.

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