How To: Restore your iPhone when you get the Error “Unknown Error 3000” or “An unknown error occurred (4027)” - Macenstein

How To: Restore your iPhone when you get the Error “Unknown Error 3000” or “An unknown error occurred (4027)”

Here’s another tip that probably will not benefit many of you, but hopefully for the few who run into this problem this post will save you some fraction of the time I wasted figuring this out.

So today Apple released the Gold Master (GM) build of iOS 7 to developers, allowing those of us with developer accounts to get the final build a few weeks earlier than the rest of the world. The only problem? When I tried to install the latest build in the normal fashion, I received an error message. TWO in fact, at different points.

“Unknown Error 3000” or “An unknown error occurred (4027)”

I kept getting these errors on two different machines, so I was pretty sure it was not the fault of the computer I was using (and that same computer had installed all the previous betas just fine). After wasting a couple hours Googling this I found a number of purported solutions, and even ended up eventually restoring my iPhone back to iOS 6 following iMore’s wonderful guide. I do not however think this actually helped solve my problem, as I still got the same error messages when attempting to install the GM Build once I was downgraded to iOS 6, using the “hold down the Option Key while clicking the ‘Restore’ button in iTunes” method, then navigating to my downloaded IPSW GM build. However, if my below solution does NOT work for you, then I say go ahead and try it again after downgrading to iOS 6.

The Solution

Anyway, what I eventually found was that for some reason or another, despite having the latest sanctioned build of iTunes running on my system, I needed to download the beta of iTunes from Apple’s site in order to update my iPhone to the GM build.

Luckily this part is easy. Just scroll a little bit down past the iPhone builds on the iOS 7 developer page, and you’ll see it. Simply download and install the iTunes beta, then follow the standard firmware update method mentioned above (holding the option key and clicking “restore” in iTunes, then selecting your downloaded IPSW GM build).

Hopefully that helps. Let me know if it does, and if it doesn’t, and something else eventually does, please post back your experience.

10 Responses to “How To: Restore your iPhone when you get the Error “Unknown Error 3000” or “An unknown error occurred (4027)””
  1. Don says:

    I am really lucky I noticed someone saying that you needed the iTunes Beta, now it’s just taking ages to load all the apps!

  2. Yvan Frey says:

    Thanks for posting this.

  3. Joel says:

    Thanks a lot for this post, I was about to go into panic mode. 😉 You really saved my evening!

  4. Clive Minchom says:

    Well done. I wasted an afternoon on this as well for the same reason. Now the iOS7 GM is installing happily.

  5. Richard says:

    This fix worked for me. I was on the latest beta and downloaded the GM. Got the error 4027 and installing the beta of iTunes fixed it. No Need to downgrade to iOS 6.

  6. Nick says:

    I was encountering the unknown error (3000) and i came across this solution which has worked perfectly.
    Thank you for putting up on the web

  7. Larry K says:

    After much pain your tip clued me into the updated ITUNES. I had tried unsuccessfully to upgrade my authorized IPhone 5 with no success. Even relented and restored to 6.1.4. I wish I had found your tip much much earlier.

  8. johnatan says:

    Thank you! just updated to iOS 7

  9. Henry says:

    Thank you so much! Updated iTunes Beta and upgraded iPhone4S to iOS7.0 GM.

  10. oliviaellaschweitzer says:

    You can recovery them as long as you have iTunes backup.

    I think now most of the data recovery program are gurantee to restore lost and deleted files from iDevice.

    But for those who claim their program can also recover photos, contacts, videos, call history etc DIRECTLY from iPhone, I still have a doubt.

    So if you are lucky to have kept an iTunes backup. I sugest you to give a shot for the datarecovery series.

    As I know Myjad iTunes Backup Extractor is kind of professional in this field.

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