Serious problem: iPhone no longer works after update!!

Discussion in 'iPhone' started by skeen, Aug 1, 2009.

  1. skeen macrumors 6502

    Jul 12, 2007
    London, England
    Hey all,

    Quite frustrated here. I updated to the new 3.0.1, and at some point an error popped up saying "Unknown error 21". Fair enough I thought, restart my iPhone and update some other time.

    Now it just goes into DFU mode, and itunes tells me I have to restore it. But when I do that, guess what error I get? "Unknown error 21".

    What a huge mistake updating was! Now I have no working phone!

    Any idea what I can do to resolve this? Thanks.
  2. PhightinPhils26 macrumors 6502a


    Sep 12, 2007
    Try pushing and holding the top button and home button to reset the phone it will reboot and tell you to restore... Try again. I updated with no problem...
  3. skeen thread starter macrumors 6502

    Jul 12, 2007
    London, England
    That doesn't work. No matter what I do I get the error. So far I have tried switching to a different USB port, removing the software update files (re-downloading the update), and I am now trying to restore it on a different computer.
  4. krayziekray macrumors 6502

    Sep 24, 2008
    Have you tried chucking the iPhone into DFU mode and trying a fresh restore?

    :apple: KrayzieKray :apple:
  5. ibuyufo macrumors 6502

    Sep 22, 2007
  6. NathanA macrumors 6502a

    Feb 9, 2008
    Does it do the same thing on another computer, too?

    -- Nathan
  7. ryanxslabaugh macrumors member

    Jun 9, 2008
    I"m having the same problem.

    Was your phone jailbreaked?

    I'm going to the Apple Store tomorrow to have them check it.
  8. taigapup macrumors newbie

    Aug 6, 2009
    phone stopped working after attempted to install 3.0.1

    I tried installing 3.0.1 today and my iphone gave me error 1604. Then it told me to restore. I attempted to restore, but that failed with error 3004. I tried rebooting, I tried checking for a more recent version of itunes, I tried powering off iphone, I tried resetting by holding both buttons until the apple appeared. I tried using another usb port. My iphone is stuck in a mode where it has a picture of the usb cable pointing to itunes. Help!
  9. Moi un Mouton macrumors 68000

    Mar 18, 2008
    Bracknell UK
    That's restore mode. You need to get into DFU mode.

    Follow this clip. Note: wait about 3 seconds after the screen shuts off before you release the power button.
  10. Goodeye macrumors 6502a


    Jan 30, 2009
    Simple people take it to the Apple Store and get it replaced or have them fix it.

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