The Last Major Upgrade Arrives for a Wear OS Pioneer
Samsung has initiated the highly anticipated rollout of the One UI 8 Watch update to the Galaxy Watch4 and Watch4 Classic. This update, based on Google's Wear OS 6, represents the final major operating system upgrade for the smartwatches that marked Samsung's pivotal switch from Tizen to Wear OS in 2021.
The rollout began on December 15, 2025, starting with the Wi-Fi variants in South Korea. Identified by firmware version R870XXU1JYK4 (Watch4) and R880XXU1JYK4 (Watch4 Classic), this substantial update weighs in at over 1GB. While this concludes Samsung's promised four-year cycle of major updates, it brings a host of new features and under-the-hood improvements to extend the useful life of these devices.
The One UI 8 Watch Rollout Journey
Samsung's phased update program for One UI 8 Watch began in mid-2025 with its latest watches and has now reached its final destination with the 2021 models.
Note: The rollout for each model started in South Korea and the US, with expansion to other global markets following a gradual, staggered release. Galaxy Watch4 LTE models are expected to receive the update after the Wi-Fi variants.
What's New in One UI 8 Watch for Galaxy Watch4
The Wear OS 6-based update delivers a mix of new health capabilities, interface refinements, and core performance gains. However, due to the 2021 hardware (Exynos W920 chipset), not all features from newer watches may be included.
New Health & Wellness Features
- Running Coach: Provides real-time voice guidance and form analysis during runs.
- Vascular Load & Antioxidant Index: New metrics for recovery and overall body status tracking.
- Enhanced Mindfulness: Includes new mood tracking and breathing exercises for stress management.
- Bedtime Guidance: Offers suggestions to improve sleep habits.
UI, Performance & Core Updates
- Wear OS 6 Foundation: Underlying platform upgrade promising smoother animations and performance improvements.
- Now Bar: Brings the quick-access toolbar from Galaxy phones to the watch for easy control of music, workouts, and more.
- Multi-Info Tiles: Customizable tiles that combine multiple data points (weather, calendar, reminders) into a single view.
- Battery Life Optimizations: Tweaks at the Wear OS level aimed at improving power efficiency.
- Low Light Mode: Makes watch faces easier to view in dark environments.
Support Status & What's Next for Your Watch4
This update marks a significant milestone in the device's lifecycle. Here’s what Galaxy Watch4 owners can expect moving forward.
One UI 8 Watch is the last.
Expected to receive patches for some time.
After Korea, wider release expected.
How to Update & Final Thoughts
Checking for and Installing the Update
To check for the One UI 8 Watch update on your Galaxy Watch4:
- Ensure your watch has at least a 50% battery charge and is connected to Wi-Fi.
- On your paired phone, open the Galaxy Wearable app.
- Navigate to Watch settings > Watch software update > Download and install.
- Alternatively, you can check directly on the watch by going to Settings > Software update.
Pro Tip: It's recommended to back up your watch settings via the Galaxy Wearable app before updating. After installation, allow a day or two for the system to stabilize and recalibrate for optimal battery performance.
Conclusion: A Fitting Finale for a Groundbreaking Watch
The arrival of One UI 8 Watch is a commendable conclusion to the software support story of the Galaxy Watch4 series. By delivering this update, Samsung has not only fulfilled its promise but also injected new life into a four-year-old product. For owners, this update brings meaningful enhancements that can extend the watch's usability.
While this is the end of the line for major OS upgrades, the Watch4's journey with Wear OS 6 ensures it remains a capable and secure wearable for the foreseeable future. For those considering an upgrade, Samsung is currently offering enhanced trade-in values for the Watch4 series towards newer models like the Galaxy Watch 8.
