Installing iPhone OS 4

Discussion in 'iOS Programming' started by chainprayer, Apr 8, 2010.

  1. chainprayer macrumors 6502a

    Feb 10, 2008
    Noob question here.. I downloaded the 4.0 software from the Apple dev site. How do I get it installed on my phone? I downloaded the proper version for my device (3gs).

    Thanks a ton!
  2. Uoila macrumors member

    Oct 20, 2007
    Short Answer

    Connect to ITunes as usual ... then on the iphone page in itunes (hold option + click "restore") then just choose the file.
  3. Uoila macrumors member

    Oct 20, 2007

    btw, here are a few hints based on the troubles i had...

    1. do a backup before u install the new OS and then copy the backup folder to another location. (~/Library/Application Support/MobileSync/Backup)

    2. Write down your UDID number (from iphone screen in itunes - click the line that says "Serial Number". It will be right above where it shows your phone number)

    3. Register your phone as a dev device in the ADC portal, otherwise it wont reactivate when your now OS boots.

    4. Uncheck "Open ITues when this IPhone is connected" on the iphone screen in itunes - this way you can restore your old backup before itunes tries to overwrite your old backup with a new one.
  4. tv3636 macrumors newbie

    Jul 21, 2009
    Alternatively, I just did an option click on "Check for Updates" and updated straight to 4.0. I backed up first anyway, but it worked fine for me (at least it's working so far!)
  5. drakeshipway macrumors 6502


    Jun 28, 2008
    Oakville, Ontario
    Where do I enter my UDID?

    I started installing 4.0 on my iPhone & then it went into recovery mode because I never entered my UDID.. because I have no clue where to enter it!!

  6. mcardlek macrumors newbie

    Jul 12, 2007
  7. dalvin200 macrumors 68040

    Mar 24, 2006
    Nottingham, UK
    OP - READ the documentation on Apple's Dev Portal.. hell they've even created video how to's!

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