can connect via the radio but not the usb ?

So I've been fighting with my new 3dr apm2.5 to get it to connect via usb it connected one time and i updated mp from 1.2.27 t 1.2.28 via a new load and usb keeps saying comport 3 does not exist. i tried a fresh load on a second computer and same thing. having a pare of linked 3dr radios from my aiop pro set up i connected it and sure enuf i can connect via the radio on com 4 i can see everything from the gps to the compass. so i tried to do a firmware update to my new fire wheelquad and i get a can not identify apm error ? so is a apm only able to connect for firmware via usb? and what is up with the usb? 

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  • When you connect the USB cable, does the board power up? If so, the wiring from the PC to the APM is probably fine.

    I recommend looking over THIS thread (again if you have before).

    I do not think the APM firmware can be updated via 3DR radio. That is not a listed feature.

    HERE is more information (to read) on the 3DR radios. The 3DR radio firmware is also updated via Mission Planner.

    -=Doug

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