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.
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.
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".
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.
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.
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
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
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?