Garmin Fenix 8/Enduro 3/Tactix 8 21.18 Beta Changelog

Garmin has released software version 21.18 Beta for the Fenix 8 series, Enduro 3, and Tactix 8 watches on January 24, 2026.

Supported Devices

This update applies to:

• Fenix 8 Pro - Premium multisport GPS watch
• Fenix 8 AMOLED - Vibrant AMOLED display variant
• Fenix 8 Solar - Solar-charging capable model
• Fenix E - Entry-level Fenix model
• Enduro 3 - Ultra-endurance GPS watch
• Tactix 8 Solar - Tactical watch with solar charging
• Tactix 8 AMOLED - Tactical watch with AMOLED display

What's Fixed in 21.18 Beta

This beta release focuses specifically on stability and bug fixes:

HRV Chart Crash Fix

Problem: Users reported that the HRV (Heart Rate Variability) chart would crash when interacting with it.

Solution: Garmin has fixed the crash issue. Users can now safely view and interact with their HRV data without experiencing app crashes.

Garmin Messenger Performance

Problem: Scrolling through long message threads in Garmin Messenger caused noticeable delays and lag.

Solution: Performance has been optimized for smoother scrolling experience, even with lengthy conversation histories.

Important Notes

• ECG Feature: Disabled during beta testing
• Dive Features: Disabled during beta testing
• Aviation Features: Disabled during beta testing

These features will be re-enabled in the stable release.

Rollout Status

As of the release, approximately 50% of enrolled beta users have received the update OTA (Over-The-Air). If you haven't received it yet, you can manually check for updates.

Previous 21.xx Versions

How to Update

1. Ensure Beta Enrollment: Must be enrolled in Garmin Beta Program
2. Check for Updates: Settings > System > Software Update > Check for Updates
3. Wait for OTA: Or wait for automatic over-the-air delivery