Jailbreak your iPhone

iREB : Fix "16xx" and "21" error during a restore in iTunes | Mac and Windows


iREB a small handy utility for Windows and Mac that can solve the mistakes “16xx” and “21” from iTunes that are displayed after a reset or a firmware downgrade. iREB is developed by iH8sn0w, and today he released a new update for iREB. The application is only compatible with EDGE iPhone, iPhone 3G and iPod Touch 1G and can be downloaded from here. The tool is available for both Windows and Mac operating system, we advised you to save this program on a secure place on your hard drive because it’s a one of it’s kind utility.


When you will be presented such an error will not have to do is start and follow the instructions on the screen. I recommend you download it and keep it somewhere in your computer .. can come in useful


Comments ( 8 )

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  1. josh October 7, 2010 Reply

    i went through snowbreeze and its stuck on “waiting for ibss”

  2. Adub March 30, 2010 Reply

    Open up snowbreeze and follox instructions after that open up IREB and click on your device wait a few seconds and this will work I had a hard time doing it without going through snowbreeze

  3. bilal March 3, 2010 Reply

    dear brothes

    i have facing the problem while restoring my iphone 3GS 32GB how can i fix eligible error while restoring

    when i trying to restore 3.1 to 3.1.2 then itunes show error (the iphone is not eligible for restore error)

    how can i fix it plz help me via email

    my email is bilal_461 hotmail .com

  4. Jimbo September 27, 2009 Reply

    I have Iphone 3G and tried to update itunes and OS tonight. Itunes updated successfully to 9.0 but when I was upgrading phone it went through everything and as it was updating it froze whle updating software. I tried to restore and now it is freezing when it gets to restoring software. My phone is useless at this point. It won’t do anytihng but show me a pic of a usb cable and the itunes logo. PLEASE HELP…

  5. RM.Harry September 25, 2009 Reply

    it does not working 🙁

  6. Maverick September 25, 2009 Reply


    That’s because you have a 3G S. When you try to restore to a lower version of firmware iTunes/Apple will not sign the firmware except for the latest firmware, which as of this writing is 3.1. The reason for it is the extra layer of security the iPhone 3G S has compared to the 3G.

  7. iPhonemod September 23, 2009 Reply

    When i try to restore iphone firmware from 3.1 to 3.0 and 3.0.1 to 3.0 by using itune
    i never got “An unknow error…” but i always got “The iPhone “XXX” could not be restored. This device isn’t eligible for the requested build. ”

    what should i do, i use itune 9.0 on mac and windows and try to itune 8.2 the result is same

    thank in advance

  8. Chuong September 23, 2009 Reply

    My Mac OS X does not come with libUSB; how can I install that thing into my mac? I googled it and I didnt find much help in installing libUSB. Any help?

    Thank you,

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