Upgraded to latest mission planner (Win8) and was unable to connect to APM via USB. When plugged in via USB board is not showing in Device Manager.

I can connect via the 3dr radios but am unable to re-install firmware. I'm guessing because the file is too large or firmware update via radio is disabled?

To eliminate variables I plugged APM into fresh XP machine which has no drivers or MP software on it. Does not show up in Device Manager. Unplugged everything from board and tried again, still not in Device Manager and getting red LED flashing (calibrating gyros?) and solid green (power).

Thanks in advance for any ideas

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PS - Board is 2.5

If the sketch on APM has somehow corrupted, could I use the Arduino IDE to upload a simple sketch -- and then load firmware software from MP?

Will do, thanks

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