Firmware updates for the CXR120/CXR200 can be carried out via the StreamMagic app or in the CXR's Webmin page.
Via StreamMagic app: the app will tell you on initial startup if there is a firmware update available for the receiver.
You can also go to 'Settings' and select 'Firmware', which will let you know if a firmware update is available.
To get to the Webmin page of the receiver, just enter the IP address (found in the CXR Network Settings menu) of your unit into a web browser of a computer, tablet or smartphone on the same network. From this page, you will be able to select the firmware update and make other changes to the unit such as its name and radio presets.