The Short Version
Amazfit pushed a firmware update to the T-Rex Ultra 2 adding heart rate zone displays and waypoint distance data for outdoor navigation.
A firmware update to the Amazfit T-Rex Ultra 2 adds heart rate zones during workouts and waypoint distance data, meaning the watch now tells you how far you are from your next navigation point while you move. Clearer navigation text and better turn-by-turn timing reduce missed turns on long routes. No new hardware, no new price, just a watch that got measurably more useful for hikers and trail runners overnight.