Overview
Garmin has posted Beta Version 23.12 for Fenix 8 AMOLED, Fenix 8 Solar, Enduro 3, Fenix E, Quatix 8, and Tactix 8 models.
This beta is available through Check For Updates rather than as a manual file load. Garmin's visible changelog is short: a treadmill calibration fix plus other minor fixes.
Update Details
- Devices: Fenix 8 AMOLED, Fenix 8 Solar, Enduro 3, Fenix E, Quatix 8, Tactix 8
- Software Version: 23.12 Beta
- Announcement Date: July 2, 2026
- Channel: Public Beta Program
- Install Path: Menu > System > Software Update > Check For Updates
- Official Announcement: Garmin Forums
Garmin 23.12 Beta Changelog
- Fixed an issue with treadmill calibration failing to result in more accurate treadmill distance.
- Fixed other minor issues.
Garmin also notes that ECG and dive features may be disabled in some beta builds and are restored in beta versions Garmin expects to become live updates. Users who rely on those features should read the full forum post before installing.
Why This Update Matters
Treadmill Calibration Affects Indoor Run Accuracy
Treadmill calibration is important for runners who train indoors and want the watch distance to better match the treadmill session. If calibration does not improve the recorded distance, users lose confidence in indoor run data.
Small Beta, Specific Fix
Version 23.12 is not a large feature release. It is a focused beta maintenance update that follows 23.11 and continues Garmin's 23.xx beta cycle.
Installation Notes
To install, open Menu > System > Software Update > Check For Updates on the watch. This is beta software, so install only if you are comfortable testing and reporting issues.
Conclusion
Garmin Beta 23.12 is a focused maintenance release for Fenix 8, Enduro 3, Fenix E, Quatix 8, and Tactix 8 beta users. The treadmill calibration fix is most relevant for runners who use indoor workouts regularly.
