Following up on the recent T-Rex 3 news, there is even more to talk about today regarding its sibling. Amazfit has officially started pushing a significant firmware update—version 4.8.3.5—specifically for the Amazfit T-Rex 3 Pro. This isn’t just a small patch; at roughly 15.65MB, it brings several functional changes that actually impact how you use the watch during a session.
Redesigned Workout Settings and Visual Feedback
The standout change in this build is a complete overhaul of the workout settings. Amazfit has moved toward a more granular approach, meaning you can now toggle specific features like the Always-On Display (AOD) on a per-activity basis. This is a huge win for battery management—you might want the screen on constantly during a quick 5K run but prefer it to stay dark during a long hike to save juice.
Additionally, they’ve added a dedicated heart rate zone display within the workout screens. Instead of just seeing a number, you get an intuitive visual of exactly which zone you’re hitting. If you want to check it out, just head into your Workout Settings > Data Pages > Heart Rate Zone to set it up.
Navigation and Data Enhancements
For those who use the T-Rex 3 Pro for trail running or hiking, the new data items are going to be very useful. The update introduces remaining distance, ascent, and descent metrics relative to your next waypoint and final destination. Having these stats right on your wrist makes it much easier to pace yourself when you’re staring at a steep climb.
The navigation experience itself feels a bit more polished now, too. They have fine-tuned the sensitivity of turn-by-turn reminders, so you should get alerted exactly when you need to veer off-path. They also cleaned up the text and UI for setting starting points and reaching your destination, making the whole “Route Navigation” process feel less cluttered.
Interaction and Algorithm Fixes
Beyond the new features, there are some solid under-the-hood optimizations. One of the best quality-of-life improvements is to the track page interaction. Now, the touchscreen activates automatically the moment you enter edit mode, removing that extra bit of friction when you’re trying to adjust things on the fly.
On the fitness tracking side, the VO2 Max algorithm has been tweaked for better accuracy. While these metrics are never perfect, more refined data is always welcome for tracking long-term progress.
When Will You Get the Update?
As is standard with these rollouts, version 4.8.3.5 is being released in phases. A handful of users are seeing the notification in the Zepp app right now, but if it hasn’t hit your device yet, don’t sweat it. It should land on most watches within the next few days. Keep an eye on your app and make sure your watch has a decent charge before you start the download.
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