Fix: iPhone Could Not Be Updated Error 4000 – iTunes

I disabled my passcode and it worked just fine!

The error seems to stem from Itunes. Of course if you use your phone to perform the upgrade over WiFi, it will skip Computer / Itunes, the upgrade will be successful. Why does Itunes cause this?

The Passcode is not the fix, as my screen does not become locked, and I still get the error message. I even tried another computer (instead of work computer) and same error.

Any help this post was 3 years ago, it's no longer relevant. We need a new blog for IOS 14 and the year 2020.

Malarky Balarky. Nothing to see here.

i just turned off pass-code and tried to update again. It worked!

Tried updating 2 different phone models (8+ and 11 Pro Max) using latest iTunes (12.10.9.3) and USB cable as I have done for the past 5 years (with these phones and previous models). Both phones failed to update from iOS 13.7 to 14.0.1 using a cable. Tried 2 different cables. Kept phones awake and unlocked. iTunes is latest version. Later, I tried updating the 8+ over WiFi and it succeeded. Ridiculous that error 4000 is not described on any of Apple's websites. Steve would be turning in his grave.

Well, I have another slant on this. Tried to upgrade to 14.0.1 via iTunes and got the 4000 error twice in succession. So I decided to upgrade directly via the iphone, and it worked fine. However, I don't think that was the cause of the issue; more, I think it was that my phone was at less than 50% battery when I tried and failed (and plugging the phone into the computer clearly doesn't draw enough power) ... and when I did update, I was plugged into a proper charger and the phone was quite happy with that. So, check your power / battery level first - may be as simple as that!

This error is coming just because of your phone being is disconnected or getting locked, the better solution is check your cable which you used to connect apple phone is working properly or not, if its working then keep your phone connected and make sure your phone is unlocked mode, please note your phone will auto lock after 30 sec or after one min so make sure u keep unlocked your phone bye touching the phone screen in between or u can play a YouTube video to prevent your phone from auto lock.
if this both is not working then try to update your phone using your phone itself. For that you have to clear your phone memory if you don't have enough memory minimum free space is 6GB or more. Hope this will work if not let me know.

I need ios13, updating via usb on pc. error 4000 continues to come up. how do i fix this

i have tried this iphone 6 which i havent used for at least 1,5 years. went to the apple store and they said they cant fix it - left it off for too long. do you think i can sell it like it is as spare parts?

when you spend more time trying to execute an update............ there is something really wrong with that picture.

unable to reset passcode from phone

i have iphone 8 plus. unable to update on phone as apple id password not being accepted. same accepted on my pc

How can I update my iPad that passcode still using but no chance to enter the system (that means when I press power button, it's always showing recovery mode) :'( ?

exactly what the problem was. passcode

im still getting 4000 error even after i put in the passcode

Thank you! Thank you! Thank you! Yes to all the comments above about the software "kiddies". Very polite compared to what I might say.

"It is also possible your iOS device locked with a passcode.." - That was the reason !