I had this issue, it turned out to be the adb driver.
I tried about 6 or 7 different adb drivers until I got one that worked.
I should have made a note of which one but I am sorry I did not.
If I find it in my downloads on my main PC I will update you here, but you should at least just start trying various adb drivers.
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Posts made by Nutterbloke
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RE: Issues porting OnePlus1