Key Takeaways
1. The Amazfit T-Rex 3 smartwatch is receiving a new firmware update, version 3.5.7.1, following the Zepp OS 4.5 update in March 2025.
2. New features in version 3.5.7.1 include mountain peak height display on maps, depth tracking for specific water activities, and improved Always-On Display status indicators.
3. The update enhances workout features, including a more power-efficient Resume Later option, an updated workout status page, and improved heart rate measurement accuracy while swimming.
4. A bug fix restores vibration alerts for the Cadence Assistant during outdoor activities.
5. The update is currently available only for U.S. users of the Amazfit T-Rex 3 smartwatch, and it can be downloaded via the Zepp App when accessible.
The Amazfit T-Rex 3 smartwatch is getting a new update, firmware version 3.7.5.1. This comes after the Zepp OS 4.5 update that started in early March 2025. This earlier update included improvements to maps, introduced a new Trail Running metric, and made upgrades to the Readiness algorithm.
New Features in Version 3.5.7.1
The latest version 3.5.7.1 includes more changes to the map application. It now shows mountain peak heights during workouts, plus you can switch the map style between a north-up view and a compass setting. For those engaging in Outdoor Freediving, Indoor Freediving, and Spearfishing, users can track their depth changes while working out. Additionally, a new feature supports status indicators on the AOD (Always-On Display) watch face. Users can also see CAPTCHA messages in the Notification Center and utilize a wrist rotation gesture to open notifications.
Improvements to Workout Features
According to the release notes, the Resume Later feature has been improved to save more power during workouts, and the design of the workout status page has been updated. Also, the heart rate measurement algorithm is reportedly more precise when swimming, with one Reddit user confirming this enhancement. Furthermore, a Facebook user pointed out that a bug related to the Cadence Assistant for outdoor activities has been fixed, restoring vibration alerts for users.
Availability of the Update
Currently, it seems that the version 3.5.7.1 update is only available for users in the United States who own the Amazfit T-Rex 3 smartwatch (currently priced at $234.99 on Amazon). It is not clear when this phased rollout will be completed. When it becomes available in your location, you can download the update via the Zepp App by navigating to Profile > Amazfit T-Rex 3 > System Update.
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