I think my amp 2.6 is viable because it lights up when I plug it into the usb port. But when I try to download the firmware for the initial setup, I get the message
"Unable to open com port"
running a new iMac with osx mavericks os
Started downloading firmware.diydrones.com/Copter/st … Copter.hex
Finished downloading /var/folders/d7/940w3y6172b61r6z53kmw_800000gn/T/qt_temp.nM9234
Opening firmware file…
Hex file loaded: 233322 bytes
Unable to open COM port: