iphone 4 keeps rebooting after 5.0.1 jailbreak

Discussion in 'Jailbreaks and iOS Hacks' started by phryedrice, Dec 28, 2011.

  1. phryedrice macrumors newbie

    Feb 18, 2011
    is anyone else having this problem? when i try to restore, i get an itunes error saying "Iphone could not be restored. An unknown error has occurred (21)."

    please help
  2. electron73 macrumors newbie

    Dec 28, 2011
    Had the same thing today, found out was a result of previous jailbreak and stuff. Go into DFU mode (google for procedure) and then do a "shift-restore" from within iTunes to a fresh 5.0.1 and voila! It should work like a charm (it did here!)
  3. nwlondonlad macrumors 6502a


    Sep 20, 2007
    UK London
    I had this problem last night for hrs. I was using a pc. The only thing that worked for me was doing the restore on my Mac.
  4. phryedrice thread starter macrumors newbie

    Feb 18, 2011
    ya i had to use my brother's mac. did you also jailbreak your phone on the mac too?

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