The Amazfit T-Rex Ultra 2 has just received its first major firmware upgrade — version 3.1.6.1 — and it’s more than a routine patch.
This update significantly expands the watch’s outdoor, tactical, and endurance capabilities with:
- Recreational scuba diving support
- Grade-Adjusted Pace (GAP) for runners
- Offline route planning directly on the watch
- A new BioCharge energy monitoring system
- Dual-color tactical flashlight + Night Vision mode
For a rugged smartwatch positioned against premium outdoor models, this is a serious feature drop.
Here’s everything new — and why it matters.
What’s New in Firmware 3.1.6.1?
Recreational Scuba Diving Mode
The headline feature is Recreational Scuba Diving support.
This pushes the T-Rex Ultra 2 deeper into true “Ultra” territory. While previous models focused heavily on hiking, trail running, and military-style durability, this update expands its underwater capabilities.
For outdoor adventurers, this turns the watch into a more complete multi-environment companion.
Offline Navigation & Route Planning (No Phone Needed)
Navigation gets a major upgrade:
- Plan routes offline directly on the watch
- Generate round-trip courses automatically
- Improved “Back to Start” functionality mid-workout
- Navigate to saved locations without reconnecting to data
For hikers and trail runners, this is one of the most practical improvements in the entire update.
Compared to navigation tools on watches like the Garmin Instinct 2, Amazfit is clearly closing the usability gap.
Grade-Adjusted Pace (GAP) for Trail & Outdoor Running
Runners now get Grade-Adjusted Pace, a metric that normalizes your speed on hills as if you were running on flat terrain.
Why this matters:
- More accurate effort tracking
- Better pacing during elevation-heavy runs
- Improved training analysis post-workout
This is a feature typically seen on higher-end multisport watches like the Garmin Fenix 7, making its addition here a competitive move.
BioCharge: A New All-Day Energy Monitoring System
BioCharge is introduced as a multi-factor energy metric.
It combines health and activity data to provide an ongoing “body fuel gauge” throughout the day.
Think of it as:
- A readiness indicator
- A fatigue tracker
- A daily recovery estimator
For endurance athletes, this adds meaningful insight beyond simple heart rate tracking.
Tactical Flashlight + Night Vision Mode
Amazfit also added practical survival features:
- Dual-color flashlight (white + green)
- Maximum brightness shortcut (UP + BACK)
- Night Vision mode in Control Center
Green light helps preserve night vision — useful for camping, tactical use, or late-night trail setups.
Small feature, big usability win.
Elevation Chart Improvements
Climbers and hikers benefit from:
- Color-coded slope visualization
- Clearer terrain readability
- Optimized workout setting interactions
These UI refinements make real-world use smoother — which matters more than spec-sheet numbers.
Is Firmware 3.1.6.1 Worth Installing?
Yes — and there’s no downside.
This is not just a bug fix update. It expands:
- Navigation independence
- Diving functionality
- Performance analytics
- Tactical usability
If you own the T-Rex Ultra 2, this update meaningfully increases its capability set.
How to Update Amazfit T-Rex Ultra 2
The rollout is phased.
To manually check:
Zepp App → Profile → My Devices → Update
If it hasn’t appeared yet, it may take a few days depending on region.
Complete Change Log Summary
- Dual white/green flashlight support
- Max brightness shortcut
- Night Vision mode
- Voice memos during workouts (Zepp Flow supported regions)
- Recreational Scuba Diving mode
- BioCharge energy monitoring
- Grade-Adjusted Pace
- Expanded coordinate formats
- Offline route planning
- Round-trip course creation
- Enhanced Back to Start navigation
- Optimized elevation charts
- Improved workout interaction settings
Frequently Asked Questions
Does Amazfit T-Rex Ultra 2 now support scuba diving?
Yes. Firmware 3.1.6.1 introduces Recreational Scuba Diving mode.
What is BioCharge?
BioCharge is an energy monitoring feature that combines multiple health metrics to estimate daily body readiness.
Can you plan routes without internet?
Yes. Offline navigation planning is now supported directly on the watch.
How do you turn on the flashlight?
Long-press the UP button. Press UP + BACK for maximum brightness.
Final Verdict
Firmware 3.1.6.1 transforms the Amazfit T-Rex Ultra 2 from a capable rugged smartwatch into a more serious multi-sport and outdoor tool.
With diving support, advanced pacing metrics, and fully offline navigation, Amazfit is clearly pushing to compete with higher-tier outdoor watches — while maintaining its aggressive pricing advantage.
For existing users, this update is a major win.
