Use the Wahoo app instead
It’s not clear to me what use this app is. It connects to the Magene sensor and shows the instantaneous data, but there’s no indication it has any functionality as far as updating the firmware. I recommend you skip this app (and the dubious Chinese company), and just use something like the Wahoo app to record your speed/cadence for workouts. Of note: all links to their privacy policy page come up blank for me.