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Question: Iphone disconnected problem during backup

I have a problem when I am trying to make a backup of my Iphone 7 and iTunes via USB cable - Iphone disconnected problem - "iTunes could not back up the iPhone because the iPhone disconnected". I cannot backup to my computer. In the same time, Wi-fi backuping to iCloud was completed succesfully.


I am using latest iOS 10.3.3 and Windows 10x64 (version 1703, build 15063.483) with all updates and latest iTunes 12.6.2.20 and good ASUS motheboard with good powerful USB 3.0 porrts and original Apple USB-ligtning cables.


I tried to use 3 different cable and 4 different USB ports, with no result.


I tried to reinstall everything, I stopped antivirus, activated "At the Plane" mode, and made all other tricks which I found here, with no result.


I had this error with previous versions of iOS and iTunes as well, but when I had iPhone 5, I did not have this error on the same desktop computer.

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iPhone 7, iOS 10.3.3, Iphone 7

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Hi all,


I found the cause and workaround solution for this case. If you received this error, the reason that you have some apps that size is too large (may be more than 3 GB size or something). At normal, such app should be file explorer or container or media player or some thing. Then, itune will show that iphone disconnected problem during backup. For my case that is related that my media player have around 50GB media files inside.

It cause this problem.

You have several workaround ways to resolve this issue.


Case 1. Don't use such app. remove it.

Case 2. Use such app and store the data into clouds and reduce local storage

Case 3. Some apps contain function not to perform backup through iTune. Enable such feature


Hope this work around can help you. In addition, this should be the bug in Apple iOS and iTune. Hope Apple will resolve this issue asap.

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Aug 13, 2017 2:36 AM in response to PalazzoCorsini In response to PalazzoCorsini

I posted my solution in another post too (check my profile),credits to iMazing team.

I will try to describe the steps:

The is a bug in iOS 10.3.3 that prevents the backup due too special characters in the files.So you have to find that app and uninstall it.


I will try to describe the steps:


-Install iMazing

-Run a back up (with iMazing not iTunes) and check the process bar % and remember the number where the backup will fail

-From iMazing start menu press "show device console",move the windows somewhere near and press PAUSE

-Start a backup again and 5-10 % before the error happens, press RESUME on device console.

-As soon as the backup fails,pause the console and press SAVE,to create a txt file.

-Now it the file search for "No operation found for path"

-You will see a line like "'No operation found for path: /var/mobile/Containers/Data/Application/9944C65F-F8E5-4CA5-951B-7B6AF0A40D1D/Documents/File-Name-With-Special-Characters'

-The first bold string is the Unique ID of the rogue APP and the second it the rogue file name.

-Try to identify the file from the type or name by googling and delete it.

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Jul 23, 2017 7:21 AM in response to gedonis In response to gedonis

The "disconnected" message usually means that the phone is not getting enough power from the computer. It needs a minimum of 1/2 amp, and works better with 1 amp. If you have any power-hungry USB devices connected to the computer (like a USB external drive that does not have its own power supply plugged into the wall) try disconnecting it/them.

Jul 23, 2017 7:21 AM

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Jul 23, 2017 8:09 AM in response to Lawrence Finch In response to Lawrence Finch

It did not help unfortunately. Nothing is connected to USB ports, except keyboard and mouse. I am using ASUS Z97-ws motherboard. And I had it a year ago, when I had IPhone 5 and it was syncing without any problems via USB-cable.

Jul 23, 2017 8:09 AM

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Jul 23, 2017 8:42 AM in response to benso888 In response to benso888

No, I am not lucky. You are unlucky. There will always be a few phones that have problems. If it were a widespread problem the 200 million or so users that have it would be posting here and all over the Internet. I haven't seen 200 million posts anywhere. I haven't even seen 1 million, or 1 thousand. I've seen a few dozen.

Jul 23, 2017 8:42 AM

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Jul 23, 2017 8:52 AM in response to Lawrence Finch In response to Lawrence Finch

When I am hearing about "lucky" or "unlucky", I am imaging casino or lottery ticket. Yes, I like lotteries and spend 2 dollars, maybe 10 dollars for a ticket. But I do not visit casinos and I do not like spending 749 bucks for the ticket, sorry, a device which has characteristics of the lottery ticket.

Jul 23, 2017 8:52 AM

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Jul 23, 2017 4:01 PM in response to gedonis In response to gedonis

I was being facetious. My point was that there is no known problem with 10.3.3 and backing up; if you have a problem, it is most likely with your device or your computer. Secondarily, there have been no widespread problems reported, so if you have a problem you should try standard troubleshooting techniques. At any given time some phones will have a problem, and, with over 1 billion phones in use, there will be others with the same problem, no matter what it is.

Jul 23, 2017 4:01 PM

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Jul 23, 2017 10:29 PM in response to gedonis In response to gedonis

I am trying to find out workaround for this. This issue is not happened in iOS 10.3.2. My iOS 10.3.2 devices work fine in backup without error. Only in iOS 10.3.3 heavy-use user will face this issue. After test success, will post in here.

Jul 23, 2017 10:29 PM

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Jul 24, 2017 4:37 AM in response to gedonis In response to gedonis

I am also one of the "unlucky" ones with backup to iTunes impossible after (and only after, never had this problem before) IOS 10.3.3 installation on iPhone 6S (disconnection message during backup/syncing through iTunes on Windows 10). Application of several suggestions found on internet fora, such as

> iPhone airplane mode,

> iPhone network settings reset,

> deletion of backups from iTunes preferences,

> manual deletion of backup folders from %appdata%,

> change of USB port,

> change of cables (all original ones),

> iPhone reboot with cable connected,

> iPhone hard shutdown/reboot,

to no avail... I concur that this is a problem Apple should consider immediately!!

Jul 24, 2017 4:37 AM

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Question marked as Solved

Jul 24, 2017 9:28 AM in response to gedonis In response to gedonis

Hi all,


I found the cause and workaround solution for this case. If you received this error, the reason that you have some apps that size is too large (may be more than 3 GB size or something). At normal, such app should be file explorer or container or media player or some thing. Then, itune will show that iphone disconnected problem during backup. For my case that is related that my media player have around 50GB media files inside.

It cause this problem.

You have several workaround ways to resolve this issue.


Case 1. Don't use such app. remove it.

Case 2. Use such app and store the data into clouds and reduce local storage

Case 3. Some apps contain function not to perform backup through iTune. Enable such feature


Hope this work around can help you. In addition, this should be the bug in Apple iOS and iTune. Hope Apple will resolve this issue asap.

Jul 24, 2017 9:28 AM

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Jul 24, 2017 10:22 AM in response to benso888 In response to benso888

benso888 wrote:



Hope this work around can help you. In addition, this should be the bug in Apple iOS and iTune. Hope Apple will resolve this issue asap.

Thank you for your research. And I hope you will let Apple know about it, so they can resolve it. Posting in this user-to-user forum is not a channel to Apple, as it is primarily for users, and Apple does not generally read what is posted. To communicate with Apple use https://apple.com/feedback. If you are a developer use the developer bug reporting site.

Jul 24, 2017 10:22 AM

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Question: Iphone disconnected problem during backup