Iphone disconnected problem during backup

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.

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.

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.

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.

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.

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.

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.

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!!

Even though I am using a Mac, I have the same problem with my iPhone 6 since the 10.3.3 update. My 2 iPads are also updated and they have no problem backing up. I have tried everything with my phone and I have posted over in the Mac thread on this issue. Just wanted to let you know I'm one of the "unlucky" ones too.

So you are practically saying the problem (probably) is the media files (audios, videos, books, mags) or large games stored within the device and you suggest removing them in order to keep backups on IOS 10.3.3... so why we even bother buying 64 or more GB iphones if we should keep it practically empty just to be able to backup? If this is not the very definition of a bug, I do not know what is...

Anyway, benso888 you are very much appreciated for this research/effort, but before we empty our iphones, can anybody else confirm this workaround/solution, or at least find the limit that constitutes this "too large" of an app/file? Is it per app (player) or per file/medium?

This is a bug related to iOS 10.3.3 and Apps. That make itune show iphone disconnected during backup. After doing workaround, all my iOS 10.3.3 devices can backup completely now. Some iOS 10.3.2 still backup complete. Some of my frequent using apps with this issue contains feature not perform itune backup. After activiate, this issue will resolve. If not possible, I need to remove it then itune backup can finish.

I agree with gedonis that this workaround with the max filesize does not work, at least for my iphone, as I do not have any app > 700MB anymore (removed anything above) and still have this backup disconnection bug... benso888 could you be so kind and provide us more details on what files you removed and what is now your max filesize?

Not me, still having the issue. Since there are many of us with the same problem, I'm assuming (hoping) Apple will fix it in the next incremental update. My iPads both back up to my Mac just fine - same USB port and cable. So it's an issue (for me) with the phone only. I've also reported it to Apple directly. Fingers crossed!