!planned obselescence! had to install a backup app (version 2.2.6) to get full functionality of my gen3 FlirOne USB-C (they removed the temp scale lock feature in version 3 of the app). personally I'd put it back, as the nature of the device gives it limited lifespan (my in-built battery is 2/3rds dead from use, for example) and featureset (the FlirOne gen3 is entry/beginner-level afterall, or as a marketing spin, "ideal for training/teenagers") otherwise, it's an amazing piece of kit worth 5*!
FLIR ONE at Google Play market analyse