Since Stratux firmware version “v1.6r1-eu028″ the AHRS flight sensor (Attitude Heading Reference System) is no longer be recognized, depending on the chips used. To fix that you can simply install a new “.sh” file via the Stratux web interface http://192.168.10.1/#/
https://abatzill.de/random/update-stratux-v1.6r1-eu028-f52fc9b25e.sh