Arduino Nano CH340: If you are like me and ordered a cheap arduino nano clone from a chinese website like aliexpress or banggood, chances are that they come with the cheaper CH340 USB to Serial chip. For me, being a mac user, I had a real hard time finding drivers etc for it. Thanks, works fine (Win7 -64).

How did you do that? Just removing the device doesn't delete the driver. It just un-links them Sometimes Windows gives you the extra option to do so but if it thinks it's still in use it doesn't. But if you have the CH340 driver installed, then plug in the CH340 and Windows will just link the driver for you.

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No need to dig through.inf files. But the fact you 'installed' FTDI drivers for it I start to think it's NOT a CH340 but just a Chinese/counterfeit FTDI which will install with the latest FTDI drivers but just will not work. Google 'FTDI gate'.