DJ-500, Wrong radio, Communications failure
DJ-500 Failure to connect to the radio from the APK-500 Programmer
Communications between the DJ-500 radio and the APK-500 Programmer will fail if the radio is receiving a signal (even noise) when you attempt either the Get data from radio or Send data to radio process. The error message will report that "The wrong radio is found".

When receiving on the main channel, the LED lights up green. When receiving on the sub-band, the LED will light blue.

If necessary, change the frequency on the radio to one that has no activity (no lit LEDs) and try the process again.