If you’re rocking an Amazfit BIP 6, T-Rex 3, or Active 2, this is the update you’ve been waiting for. Zepp OS 4.5 just dropped, and it’s not your typical “bug fixes and stability” update.
Nope—this one brings legit improvements that make a difference in daily use, especially if you’re on an iPhone (finally, right?).
Let’s break it all down in real words—what’s new, what works better, and why this update matters.
Big Win for iPhone Users: You Can Finally Reply to Messages from Your Watch
Let’s start with the headline:
Yes, iOS users can now reply to messages directly from their Amazfit watch.
No more frustration from just reading a message and pulling out your phone to reply. With Zepp OS 4.5, Amazfit is bringing AI-powered smart replies to iOS, and honestly? It’s a game-changer.
Here’s how it works:
- A message pops up on your watch.
- You tap it, and now—you can write or dictate your reply.
- The AI can even summarize a voice message for you.
- You hit send, and that’s it. Done. From your wrist.
As someone who’s used Amazfit for years, this alone makes the update worth it—especially during workouts or meetings when your phone’s not in reach.
You still can’t view or send images on iOS (that’s still Android-only), but hey—it’s a huge step forward.
3,000+ New Icons and Emojis = Notifications That Actually Make Sense
Ever gotten a notification on your watch and all you saw were weird symbols or blank squares? That’s fixed.
Now you get:
- Cleaner app icons
- Emojis that show up
- Better-looking notifications overall
It may sound small, but it makes your watch feel less like a gadget and more like a polished extension of your phone.
For the Trail Lovers: T-rex 3 Gets Serious Outdoor Upgrades
If you’re using the Amazfit T-Rex 3, the update is especially sweet.
Zepp OS 4.5 adds:
- Waypoints – Mark important spots on your route
- Distance tracking – See how far to the next checkpoint
- Smoother maps – No more screen shaking while you’re hiking or running
I tried this out on a quick trail run, and it just felt more stable. The route screen didn’t stutter, and I could glance down for direction without breaking pace. If you love the outdoors, this is a big quality-of-life upgrade.
New HOX Mode + Smarter Fitness Tracking
Let’s talk about workouts.
Zepp OS 4.5 adds support for HOX training, which is Amazfit’s take on extreme cross-training—think CrossFit, but even more intense.
But here’s the cool part:
The update now tracks transitions between exercises. Before, those little breaks or switches between moves weren’t recorded.
Now they are. That means your effort is tracked more accurately, and recovery data is more useful.
Add in updated algorithms for sleep, recovery, and daily readiness, and it feels like your watch is finally starting to “get” how hard you’re pushing yourself.
Whether you’re a casual gym-goer or someone chasing performance goals, this update helps you train smarter, not just harder.
Here’s What You Get (And What You Don’t)
✅ Available on Amazfit BIP, T-Rex 3, Active 2:
- AI replies on iOS 🎉
- Voice note summaries
- Improved sleep/recovery tracking
- HOX training mode
🏞️ Exclusive to T-Rex 3:
- Custom GPS waypoints
- Advanced map stability
- Route-by-waypoint navigation
❌ Not (Yet) on Amazfit Balance:
- If you’ve got the Balance, hang tight—Zepp OS 4.5 hasn’t rolled out for that model yet, and no official word on timing.
Amazfit’s Update Game is Strong Right Now
One thing I appreciate: Amazfit is listening. The T-Rex 3 alone has seen over 10 updates since its launch. That’s not normal for a fitness watch brand—and it’s a big deal.
Why? Because it means your watch stays fresh. You’re not stuck waiting a year for improvements, and they act on feedback from real users.
That gives me confidence not just in the device, but in the whole ecosystem.
Let’s Talk: What’s Working for You?
Have you tried the new AI replies yet? Are you noticing a difference in your workouts or sleep tracking?
Drop your thoughts in the comments. I’d love to hear what you think about Zepp OS 4.5—and if there’s anything still missing or not working right.
Let’s help each other get the most out of these smartwatches.
And hey, if you found this post helpful, share it or subscribe for more Amazfit tips, updates, and real-world reviews. Let’s make this a space where smartwatch users help each other.
Until next time—stay fit, stay curious, and keep exploring. 🧭⌚💬
