error 1600 and 21

Discussion in 'iPhone Tips, Help and Troubleshooting' started by harold1, Dec 28, 2011.

  1. harold1 macrumors newbie

    Joined:
    Dec 28, 2011
    #1
    Keep getting itunes error 1600 when trying to upgrade with pwn DFU and error 21 when trying to upgrade with restore mode. Can not figure how can I upgrade to 5.01 from 5.0. Any ideas? I
    Tried 2 computers, no luck.

    I have the same problem as the dude above except mine os occurring when trying to upgrade ios4.1 to 5.01. anyone have any ideas?
     
  2. Sly3GS macrumors newbie

    Joined:
    Jan 2, 2012
    #2
    Using my wires MacBook helped

    Hi Harold1,

    I seem to have had a similar problem.
    When trying to upgrade from a iPhone 3GS 4.3.3 to iOS5 (I had installed Cydia months ago, never used it and I felt it did not work properly (lost app icons, progress indicator everywhere)) and thus wanted to completely wipe and upgrade it.
    When trying from my own Mac, I run into the vicious "Error 21 -> maintenance mode" cycle which forced several reboots and always ended up again in maintenance mode. I saw my iPhone already in iPhone heaven.

    On my Mac also TinyUmbrella is installed, so maybe some hostlists have been altered which may cause this issue.

    After several fruitless attempts I simply connected the 3GS to my wife's MacBook and there iOS 5 was downloaded and installed without any problems. I now kept it as "new" iPhone but re-established the link to my iTunes library.
    So far everything fine. I guess TinyUmbrella and Cydia somehow cause issues.

    Best regards,
    Sly
     
  3. porsche928 macrumors newbie

    Joined:
    Jan 4, 2012
    #4
    Hosts file!!!

    THanks Guys, basically I pulled the hair outta my head for a good few hours into the night ... till I saw the above post and recalled that I had once in a previous life jailbroken my iPhone3 and set my hosts file up. Once I commented out the old Cydia server in the file, I was able to restore in iTunes ... (was getting both 21 and 1600 errors btw) CHEERS!!!!
     

Share This Page