A Device Attached to the System is not Functioning is a very common error found in every Apple iPhone devices while performing data transfer. If you have encountered such error while doing data transfer from iPhone to PC, then it doesn’t mean your device is faulty or defective. Instead there is a fix for this and after applying the fix you won’t receive such error.

Error | A Device Attached to the System is not Functioning |
Trigger | Transferring Data from iPhone to PC via File Explorer |
Device | Apple iPhone and Other Apple Devices |
The below screenshot is of the error “A Device Attached to the System is not Functioning” triggered while copying video and image files from iPhone to PC using the File Explorer.

Solution to A Device Attached to the System is not Functioning
Disconnect your iPhone from PC if already connected
Open Settings on iPhone

Scroll down settings page and tap on Photos
Scroll down the Photos page and locate “Transfer to MAC or PC”

In Transfer to MAC or PC, by default Automatic will be selected

Here you need to change it to Keep Originals
That’s it, now connect your iPhone to PC and try transferring the Video and Images from iPhone to PC using File Explorer

Now you won’t come across such error while copying the files.
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