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Discuss stuck in DFU mode permanently :( error 21 at the iOS 4.x (iPhone OS 4.x) - Hackint0sh.org; Hello, I have big problem with software in one iPhone. So is stuck in DFU ...
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    Default stuck in DFU mode permanently :( error 21

    Hello,

    I have big problem with software in one iPhone. So is stuck in DFU mode after upgrading from 4.0.1 to 4.2.1. Now screen is death when i push power button and power +home for 10 seconds, 30 seconds, 1 minute I tried many combinations. When I connect it to PC than is detect in DFU mode iTunes says the same thing, screen is all the time death. I can click restore choose iOS but i had trying few like 4.2.1, 4.1, 4.0.1 and at the beginning everything is ok but at one moment iTunes trying to reconnect i hear the sound unplug and plug in then iPhone screen turn in to white and iTunes inform me about error 21. When TU is working iTunes give me error 1602. Blackra1n see device but is stuck on running and screen is all the time black.

    iPhone 3g
    Windows XP sp2

    Please help me



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    Super Moderator Array Olethros's Avatar

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    Try to restore 3.1.3
    Please read the stickies & search forum before posting!
    How to report an iTunes restore/update fail in a useful manner
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    iPad 3G 64GB (4.3.3, Redsn0w) oldest SHSH 3.2.2
    iPhone 4 32GB (4.2.1, Redsn0w JB-monte) oldest SHSH 4.1
    iPhone 3GS 32GB (4.3.3; Pwnagetool) factory unlocked oldest SHSH 3.1
    iPhone 8GB (3.1.3; Pwnagetool) AT&T Locked - Unlocked with bootneuter

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    Default

    Quote Originally Posted by Olethros View Post
    Try to restore 3.1.3
    everything is the same error 21 when iPhone is preparing to restore :/

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    Super Moderator Array Olethros's Avatar

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    Quote Originally Posted by korni1989 View Post
    everything is the same error 21 when iPhone is preparing to restore :/
    Restore logs? http://www.hackint0sh.org/f137/130802.htm
    Please read the stickies & search forum before posting!
    How to report an iTunes restore/update fail in a useful manner
    -

    iPad 3G 64GB (4.3.3, Redsn0w) oldest SHSH 3.2.2
    iPhone 4 32GB (4.2.1, Redsn0w JB-monte) oldest SHSH 4.1
    iPhone 3GS 32GB (4.3.3; Pwnagetool) factory unlocked oldest SHSH 3.1
    iPhone 8GB (3.1.3; Pwnagetool) AT&T Locked - Unlocked with bootneuter

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    Did we solve your problem? Got a dollar or two spare ? Donate!

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    Default

    iTunes version: 10.1.0.56
    iPhone OS version: before 4.0.1 it was trying update to 4.2.1
    Platform: OS X (here iPhone fell in DFU) and Windows
    OS version: 10.5 and XP sp2
    iTunes restore Log: #1412233 - Pastie


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    Super Moderator Array Olethros's Avatar

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    Please read the stickies & search forum before posting!
    How to report an iTunes restore/update fail in a useful manner
    -

    iPad 3G 64GB (4.3.3, Redsn0w) oldest SHSH 3.2.2
    iPhone 4 32GB (4.2.1, Redsn0w JB-monte) oldest SHSH 4.1
    iPhone 3GS 32GB (4.3.3; Pwnagetool) factory unlocked oldest SHSH 3.1
    iPhone 8GB (3.1.3; Pwnagetool) AT&T Locked - Unlocked with bootneuter

    -
    Did we solve your problem? Got a dollar or two spare ? Donate!

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    Default

    But I have two iPhones one in good condition is working well and second wich is broken and has error 21 and first iPhone i can restore with any problems on the same machine as second has error 21 so I don`t think this is problem with iTunes version, system or machine.

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    Super Moderator Array Olethros's Avatar

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    Quote Originally Posted by korni1989 View Post
    But I have two iPhones one in good condition is working well and second wich is broken and has error 21 and first iPhone i can restore with any problems on the same machine as second has error 21 so I don`t think this is problem with iTunes version, system or machine.
    All I know is that in my experience (and backed up by Apple's documentation) error 21 is not a hardware issue with the iPhone itself. It's a software problem.
    Please read the stickies & search forum before posting!
    How to report an iTunes restore/update fail in a useful manner
    -

    iPad 3G 64GB (4.3.3, Redsn0w) oldest SHSH 3.2.2
    iPhone 4 32GB (4.2.1, Redsn0w JB-monte) oldest SHSH 4.1
    iPhone 3GS 32GB (4.3.3; Pwnagetool) factory unlocked oldest SHSH 3.1
    iPhone 8GB (3.1.3; Pwnagetool) AT&T Locked - Unlocked with bootneuter

    -
    Did we solve your problem? Got a dollar or two spare ? Donate!

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    Super Moderator Array n1ckn4m3's Avatar

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    Quote Originally Posted by Olethros View Post
    All I know is that in my experience (and backed up by Apple's documentation) error 21 is not a hardware issue with the iPhone itself. It's a software problem.
    Agreed. Every time I've had this error it's been when Apple/iTunes/my iPhone just didn't like a specific charging cable/dock cable, or a specific USB port or controller on my machine. Switching computers / cables / USB ports / controllers has *always* resolved this for me. EVEN when the same cable / port / controller / computer was capable of flashing previously. This became ESPECIALLY notable at 4.0 -- for some reason a lot of cheap dock cables would just crap out during the flashing process.

    I can't, of course, state 100% that it will work for you -- but I'm definitely in agreement with Olethros about this.
    The preceding forum post has been brought to you by the letter "N" and the number 42.

    iPhone 4, 32GB (iOS 6.1.2 | evasi0n | SHSH: 4.0 - 6.1.2)
    iPad 2 3G, 64GB (iOS 6.1.2 | evasi0n
    |
    SHSH: 4.3 & 4.3.3 - 6.1)

    Restore problems? Read this: http://www.hackint0sh.org/f137/130802.htm

    Did we solve your problem? Got a dollar or two spare? Please Donate!


 

 

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