(Note: the Apogee Control iOS app is for Element & Ensemble Thunderbolt devices. Make sure you are using "Control 2" iOS app for Boom.)
Boom must be updated to the latest firmware in order to communicate with the Apogee Control 2 iOS app when connected to iOS devices.
*This firmware update must be done on a Mac or Windows PC computer. It cannot be updated when connected to an iOS device.
First Download and install Boom software for Mac/Windows.
To update Boom's firmware, press and hold in on Boom's Main knob when connecting the USB C cable to your Mac/Windows PC.
Keep holding for about 2-4 seconds and a dialog will appear to update firmware.
Once updated you can then check your current software and firmware version in Apogee Control 2 > Preferences.