Just bought a used Harmoy 550 on eBay and it only lights up or shows any text when the unit is plugged into the PC / setup software.
I tried multiple sets of batteries, but it seems dead in the water unless it's plugged in.
Any ideas?
Hold down power button while connecting usb to PC. Goto Logestic home site then support and download firmware.
I ended up getting a replacement unit from the eBay seller (it was still under warranty). I never could fix the original one I received, with firmware updates or anything...sorry!
I got exactly the same problem.
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