Updating iPhone 5 to iOS 7 Beta 2 (resolving “An Unknown Error Occured -1”)

With the release of iOS 7 Beta 2 today, I felt like (finally) taking the leap and upgrading my iPhone to the latest version of iOS.
I downloaded the image and tried to restore (after taking a fresh encrypted backup) in iTunes 11.0.4, however I was presented with the following error message after the firmware was extracted:

Screen Shot 2013-06-25 at 00.48.56I tried 3 times to restore my iPhone to iOS 7 in iTunes, before I gave up. Always the same error message. However, it turns out that opening the iOS 7 firmware ipsw file (iPhone5,2_7.0_11A4400f_Restore in my case) in Xcode did the job: after selecting my iPhone 5 in the “Organizer – Devices” application (which should have opened automatically when you opened the ipsw file using Xcode), I could pick iOS 7 from the iOS dropdown list and restore from there.

Screen Shot 2013-06-25 at 00.55.22

After installing iOS 7 on my device (took about 5 minutes), I needed to close and re-open iTunes 11 for it to recognize my phone again. After that, I was presented with a screen to restore from the backup I created earlier in iTunes. And behold, iOS 7 is installed! Or not … My phone rebooted approximately 10 times while restoring the backup, and each time when it arrived at a certain point (around “syncing application 10 of XY”) my phone rebooted again. It was somehow stuck in an endless reboot, even after canceling the restore in iTunes.

I restored the phone again to iOS 7 in Xcode, and by setting up the phone as a new phone in iTunes (instead of restoring from backup), everything runs fine now (albeit without restored backup so far). Manually restoring contacts and a few apps from within iTunes finished in a few minutes, after which I could start enjoying iOS 7 (at last!). A few impressions after the break:

IMG_0001 IMG_0002 IMG_0003

IMG_0005 IMG_0006 IMG_0008

IMG_0007 IMG_0004 IMG_0002


  1. Kdog

    Dang this still didn’t work for me. Gave me another kind of error this time and made me restore through iTunes back to previous version.

    It did seem to get further than trying to update/restore through iTunes… I have all software upto date and even just got OS X Mountain Lion incase that was the problem.

    Any other ideas?

      • rgrtht

        I get “An unknown error occurred (4027) when trying to update my developer iPad Mini from iOS 7 beta 3 to 4. I’ve scoured the net a little but no joy. Any ideas?

          • AncAinu

            Thanks so much, I wonder why Apple don’t write we need to install it in the important tips before updating…

          • Alan B

            The mobile installer package worked !!!! I’m an Apple developer, got stuck upgrading between iOS 7 beta 3 and 6 , getting an error updating via itunes and my wi-fi update had failed with “unable to verify”. Installed the mobile installer package from the ios7 download page, did an update via itunes and it works !! Thanks so much !

  2. iOS 7

    A tethered jailbreak is better than nothing, but it meas each time the phone boots
    up it has to be jailbroken again. The evice wjll noot
    start after the reboot and it will hang on the apple logo.

    From this day forth, our coollective i – Lives
    should be untethered.

    my weblog … iOS 7

Post a comment