Presently, you must use the Gimbal Beacon Manager application for iOS that can be installed from the Apple App store.
Once logged in, tap the settings button and then tap the “Configure” menu option.
Follow the directions on screen. Notice that the firmware on the beacon does not match the firmware indicated from the server. Furthermore, there will a note indicating “firmware will be updated”. Tap the 'Update' button to apply the update.
Update: May, 2017: A version of Gimbal Beacon Manager for Android is planned to be released in the near future.