Hi Guys,
You need to change the configuration file in your flarmMouse, using the Flarm Configuration tool available from the flarm.com website. It's a bit complicated but there are instructions available on the Flarm and LXNav websites.
Basically you need to connect your flarm Mouse to your PC or laptop, or better still, remove the microSD card and put it in a PC or laptop, then change the ICAO aircraft address setting in the 'Device Settings / Advanced / Device ID for Radio Communication' section of the configuration tool to the correct ‘Hex ID’ for your aircraft - which should also be set in 'Configure' in your PilotAware.
Any problems come back to me.
Regards
Peter