Previous 1 2 3 Next 73 Replies Latest reply: Aug 13, 2010 2:38 AM by Todd Craft
M3G4 Level 1 (0 points)
Hi all,

Just tried to update to iPhone OS 4, first download failed with a "Firmware Corrupt" error, so it downloaded again. It seemed to succeed, but then got so far and stopped with an "Unknown Error Occurred (21)", and now my iPhone is stuck in recovery mode.

What on earth am I supposed to do now?

I am not pleased =(

Message was edited by: M3G4UK

Message was edited by: M3G4UK

Intel iMac 20", Macbook 13", Mac OS X (10.5.8)
  • EBSkater Level 2 (490 points)
    Unplug, then replug it in. iTunes will be aware of iPhones/iPods in recovery mode, and will let you restore them.
  • M3G4 Level 1 (0 points)
    I've done that - it's a case of wash, rinse, repeat. It just keeps failing with the same error.
  • timmeyboy Level 1 (0 points)
    Yeah I've had the same problem, iphone is now dead!!
    Won't reboot and won't restore!!!
  • stevessvt Level 1 (55 points)
    Access to another computer? Try another, or try reinstalling itunes, see if that helps.
  • jonpollock Level 1 (0 points)
    mines doing the same thing, now its stuck on the on the plug into itunes screen and wont restore on my macbook or do anything, so im currently sat with a phone that will not work now.
  • M3G4 Level 1 (0 points)
    Sad thing is, this is becoming regular with every new iPhone major software update. Apple needs to learn from this, and learn FAST. I will certainly NOT be buying an iPhone 4 now.
  • jonpollock Level 1 (0 points)
    mines never done this before, ever, what are you supposed to do with the phone now then?? cos mine is currently useless
  • M3G4 Level 1 (0 points)
    USUALLY it's Apple's authentication servers failing, so wait a few hours so Apple will let you use your phone again.

    Otherwise, Apple's authentication servers have failed, and taken your phone with them. Replacement iPhone time in that case...
  • timmeyboy Level 1 (0 points)
    I've gone into the iphone software update folder and removed the iphone 4.0 file thats in there,
    Reconnected my ipod and now it seems to be downloading 4.0 again,
    it's gonna take about 20 minutes.....
  • jimbobpro Level 1 (0 points)
    get it into DFU not recovery and try again n see how u go i had the same issue with mine when gm came out and i had to put it into DFU mode and for all you people about to ask isnt DFU and Recovery Mode the same NO THERE NOT!!!!!!....
  • jonpollock Level 1 (0 points)
    tried DFU said the exact same thing, unknown error(21)
  • mikebookpro1 Level 1 (35 points)
    I wish mine would brick so i could go get a new phone! I dont think im going to update though in order to get the most for my 3gs when i sell it after i get my 4.

    I updated my wife's phone, its def cool! Weird to unlock the phone and have the same background as the lock screen. Spell checker is cool too! Havent played with multitasking or anything yet.
  • Scott P. Level 6 (16,840 points)
    M3G4UK wrote:
    Sad thing is, this is becoming regular with every new iPhone major software update. Apple needs to learn from this, and learn FAST. I will certainly NOT be buying an iPhone 4 now.




    Curious. Not once with an iPhone update, nor before that with an iiiPod touch update, nor before that back to the 3G iPod in 2003 have I once had an issue with a firmware update. Looks like that must be the norm on these updates and that Apple has it under control. MAkes me wonder what in your personal setup is causing the issues. I know folks hate to hear that, but facing a lack of complete install failure for everyone across all platforms and devices, it is most likely not a problem with Apple's end of this.
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