Key Takeaways
1. The Amazfit T-Rex 3 smartwatch is receiving its first update for Zepp OS 5.0 since September 2025.
2. The update features a new user interface, updated animations, and accessibility options like adjustable font sizes.
3. New activities, including Scuba Diving, hiking, and weighted hiking, have been added, along with a BioCharge feature for tracking energy levels.
4. The T-Rex 3 now supports topographic maps and is compatible with the Stryd pod, with new alerts for uphill routes and a Jet Lag Manager.
5. The software rollout for version 4.1.5.1 is gradual, starting in China, the US, and Canada, before expanding to a wider audience.
Amazfit’s T-Rex 3 smartwatch seems to be getting its first update for Zepp OS 5.0. The last time this model saw an update was in September 2025, when it received new running dynamics along with extra keyboard layouts.
Update Details
Users in the Amazfit T-Rex 3/3 Pro Group on Facebook and the 4PDA forum have noted that Zepp Health is now releasing software version 4.1.5.1 for this smartwatch. The upgrade to Zepp OS 5.0 introduces a new user interface for the T-Rex 3, featuring updated animations and a more fluid experience. There’s a new option to modify font sizes under the Accessibility settings, and users can take screenshots by pressing the SEL and DOWN buttons at the same time. One user mentioned that Scuba Diving has been added as a new activity.
New Features
The eagerly awaited BioCharge feature replaces the older Body Battery function, allowing users to keep track of their energy levels. New sports activities, such as hiking and weighted hiking, are now included, and users can also add weights to workouts like trail running, mountain climbing, and hill climbing. The T-Rex 3 now supports topographic maps for activities like kitesurfing and skydiving, and it is also compatible with the Stryd pod for runners. Additionally, uphill alerts have been introduced as part of route guidance, along with a new Jet Lag Manager. Furthermore, users can zoom in on images within the Notification center and adjust their nap records.
Rollout Process
Software version 4.1.5.1 is being rolled out gradually to T-Rex 3 smartwatch users (currently priced at $226 on Amazon). Typically, updates are first made available to users in China, the US, and Canada, before becoming available to a broader audience about a week later.
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