I rmbr when i had this prob, what i did was restart pc, then connect phone to lightning connector before connecting the usb port to pc. Looks out for that pop-up asking to 'trust this computer' if it comes out.
Yes! when i plug in on Macbook i saw the pop-up asking ('trust this computer')
But... on windows is allow and Don't allow
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both also cannot connect to iTunes....
Device no found!!But my computer can see my phone picture @ folder.

