Previous 1 2 Next 23 Replies Latest reply: Feb 10, 2012 9:39 AM by tzmac
neng6925 Level 1 Level 1
Dear Apple
I've tried to update from 3.0 to 4.1 OS for my iPhone 3G yesterday.
After I have updated it, I could not turn off my iPhone anymore.
It kept restarting many times I've tried to turn it off.
Then I plugged in the wall chart for a night.
In the next morning, it kept shut down every time I press the power button and the machine was hot all the time.
I don't know how to solve this. So I tried to restore my phone back to where I was.
My iTunes keep saying that unknown error occurred 1654 every time I tried to restore.
I have tried to update it to OS 4.2 and the result was the same error 1654
I cannot find the way to solve this.
Please tell me how to solve this.
It is painful to me.
iPhone 3G HK

Dell inspiron, iOS 4
  • socokid Level 4 Level 4
    I'm not sure, but the same exact thing is happening to me. I cannot update, or restore my phone. I've soft reset, hard reset, let it die of batter for a while, recharged, etc...

    I've even tried on other Macs, keep getting error 1645. So, I know it's the iPhone, not the machine or any software on the machine.

    Going to be taking it to the Apple store, but if there is a solution, I would like to know as well. The iPhone works well otherwise, just stuck at 4.0. 3Gs for me.
  • Lawrence Finch Level 8 Level 8
    Mac OS X
    It's probably an issue with your computer rather than the phone. See:
  • socokid Level 4 Level 4
    It is not.

    I've tried on 3 different machines, running OS 10.5.8 to 10.6.6. Same error message each time.

    "The iPhone "xxxx" could not be updated. An unknown error occurred (1645)."

    I have tried every single thing mentioned online and in apple KB articles. I get this when attempting to restore or update my iPhone on any Mac I've tried it on. A MacBook Pro, an iMac and a Mac Pro. All less then 3 years old.
  • samlewisgraham Level 1 Level 1
    I kept getting the "Unknown 1645" error. iTunes wouldn't let me update/restore my iPhone. Until I came across this, which worked and now my iPhone is fully operational again.

    1. Disconnect your iPhone cable but leave connected the other USB end to the computer.

    2. Turn off your iPhone holding the Sleep/Wake button. The red slider bar appears. Slide the bar and wait until the iPhone turns off. Or you could hold the Sleep/Wake and Home buttons at the same time until the iPhone turns off.

    3. While pressing and holding the Home button connect the USB cable to your iPhone. It should power on. Hold the Home button until you see the "Connect to iTunes" message. Open iTunes if necessary. You should see the "iTunes detected an iPhone in recovery mode..." alert screen.

    4. Choose "Restore".
  • AlPhilly Level 1 Level 1
    I have tried all the above options... my phone will not restor. It just sits there at the prgress screen and... nothing. I have had it to sit in this state for two days in a row just to see how long this will take.

    I now am unable to use the phone at all.

    What other recomendations do you have?
  • RipePickings Level 1 Level 1
    Hi 1654 and 1645 are hardware error messages. A chip in your device isn't working, whether due to water, heat, dropping, dirt or just malfunctioning.

    Your only hope is to hope its dirt, take the Iphone completely to pieces and brush clean the circuit boards.
    I suspect if its water you will know? It may still be possible to fix it using the above method - look for solder points that have been corroded and try to excavate them with a brush and flat head screwdriver. But you'll be lucky, especially if you have been turning it off and on a lot trying to fix it as that will only make the problem worse.

    Alternatively take it to apple, they're quite good and may replace it anyway, worth a shot at least before you open it up.
  • Dr Obnxs Level 1 Level 1
    I just had this happen on my wife's iPhone 3Gs. I updated the computer OS and the phone updated. Maybe I just got lucky, but it wasn't a persistent problem for me.

  • Daniel Garcia Castellanos Level 1 Level 1

    Try placing the device in DFU mode:


    1- Plug into computer

    2- Turn off by holding power/lock button (on top) until red slider shows up, swipe red slider

    3- Follow the next sequence of steps rather closely:

        a. hold the power/lock button (on top) for about 3 seconds

        b. while still holding the power button, press the home button, wait for about 10 seconds

        c. let go of the lock button on top, keep the home button pressed for about 10 seconds

    4- iTunes should now report that the device is in recovery mode.


    Try restoring now.

  • Neo911 Level 1 Level 1

    Had issues with error 1654 while attempting to upgrade to iOS 5 on my iPhone 4 twice.  Tried my wife's phone and had the same thing 2 more times.  Your solution to put it into DFU mode worked perfectly.  Thanks. 

  • MichaelValery Level 1 Level 1

    I was just going to say that when I installed the iOS 5 on my iPhone 4--it worked just fine.  When it came time to do my partner's phone I had error 1654.  After reviewing and trying the steps from October 13th reply, I was able to update without a hitch.  Thank you Daniel Garcia Castellanos.  You are the best.  Especially since the Apple Care Team was closed for the night.  A lot of help they were.  Thank you.  Mike

  • TiloApfel Level 1 Level 1

    same here with Win7 SP1 64 and iphone 3GS 16GB

    First got the 2011-10-17 20:40:00.072 [1120:58c]: iTunes: Restore error 1645


    after trying to follow the recovery DFU way as

    Daniel Garcia Castellanos


    describe it I got a 36 error

    2011-10-17 20:53:20.318 [1120:aa8]: <Restore Device 0removed>: Restore failed (result = 36)

    2011-10-17 20:53:20.568 [1120:58c]: iTunes: Restore error 36


    I also tried to remove the SIM PIN as heard this could cause trouble with iOS 5. any other ideas?




  • roel00 Level 1 Level 1

    Same here. Tried everything including DFU, but no luck. First 1645 error and right after DFU and recovery iTunes drops me a error 36. Can't find any solution. Tried updating on three diferent machines.

  • Daniel Garcia Castellanos Level 1 Level 1

    Note that DFU mode shows a black display on the unit. If anything is showing, like the "connect to iTunes" recovery screen, it is NOT in DFU mode.

  • TiloApfel Level 1 Level 1

    I first had it in recovery mode with the symbol on my iPhone, the second try I got it in DFU mode I guess as the screen was black and iTunes report phone in recovery mode.

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