Comments on: iPhone 3.0 Upgrade Fail: “Unknown Error”

By: Lisa

Lisa — Sun, 17 Jan 2010 10:28:23 +0000

Got the same message today I just kept going to itunes and ran the software again and my phone was restored.

By: derek gibb

derek gibb — Fri, 30 Oct 2009 13:45:39 +0000

Stephen Mcmaster! What a man! I have sent my phone to o2, had them replace a part because apparently it was a “hardware error”. Came back still not working!

Just followed your instructions and now working perfectly.

Cheers mate

By: Erick

Erick — Mon, 12 Oct 2009 03:30:54 +0000

Thank you! Thank you! Thank you! 3 hours wasted on code 1640 until I found this. half hour and it is restored synced and running again.

By: Jeepboy

Jeepboy — Wed, 30 Sep 2009 02:02:01 +0000

I plugged my iPhone into my computer trying to upgrade to 3.1 and after iTunes opened there were some “gleek gleek” and”doink” noises that seemed to cease after I plugged into another USB port. But sometime during the upgrade the phone froze, so I tried to do a restore, but got an error message that said “no can do”. From there the phone had a picture on the screen of the USB plugging into iTunes, and
that was all. Someone in an earlier post said they got a new USB cable and that solved the problem. So I got one too. A big beefy MF from Belkin. Plugged in the new cable, the phone connected to iTunes, did what it was supposed to do, installed 3.1, restored my photos, contacts, etc., and I’m good to go. Worth a try.

By: Raina

Raina — Mon, 28 Sep 2009 16:41:48 +0000

I have a problem!!! please help…

when i was restoring my iphone with 3.0 upgrade, my computer shut down suddenly, it caused the stop of upgrading, only “back-up my phone” was successful(mean it failed to upgrade and nothing inside, is it?), my phone was showing an apple logo there(i think it just hung here, as it was preparing restore), and computer could not detect it anymore.

In other hand, the control/del/alt seemed not working…anyone know how to solve it? please…

By: Ashley

Ashley — Thu, 17 Sep 2009 22:47:32 +0000

Ctrl-Alt-Del trick worked for me too!! Reset ITunes when 1604 error showed, iTunes and phone then loaded/worked corecctly! Error 1604 was a nightmare to resolve… nothing worked until this

By: Ian S

Ian S — Sun, 06 Sep 2009 18:49:08 +0000

Ctrl-Alt-Del was the solution!!
Hugh Thanks to Stephen !
spent several hours to restore it until i found this post!!
Thumbs up!!!

Thanks ..!

By: James Garvey

James Garvey — Fri, 28 Aug 2009 19:34:15 +0000

Try post 29 or 48 (mine).

You should start from square 1, which is putting your iphone into DFU mode and restoring it completely. I’m assuming you have a 3G and that 2.x was working fine. Go back to 2.x using my instructions in post 48. Then try to upgrade again. Don’t forget to clean out the apple software download folder before you start. Read back through the older comments in this post and McMaster tells you how to do it.

By: Enmanuel P.

Enmanuel P. — Fri, 28 Aug 2009 19:28:13 +0000

that didn’t work either!
someone else please..??

By: James Garvey

James Garvey — Fri, 28 Aug 2009 19:04:25 +0000

Try to hold the power button down until your PC shuts off. Or control alt delete several times in a row.