When playing music via Apple AirPlay on my Apollo RA770, my NRX300 remote shows 'unknown source' on the screen. How can I fix this?

Please update the software of your NRX300 remote. Before updating please ensure your stereo is also running the latest software version.

To update follow the steps below.

1. Turn on the remote and connected stereo

2. Select Settings

3. Select Update

4. Select MS-NRX300 to allow the remote to update