[Garmin Firmware ChangeLog]: What's New in 27.09 | Forerunner 255

Overview

Garmin has launched the 20% phased rollout of Software Version 27.09 for the Forerunner 255 Series. This popular budget-to-mid-range running watch continues to receive regular software updates and improvements.

Update Details

• Device: Garmin Forerunner 255 Series (all sizes)
• Software Version: 27.09
• Rollout Status: 20% Phased Rollout
• Expected Full Availability: January 25-30, 2026

What's New in Version 27.09?

System Updates

• Manufacturing support enhancements for hardware consistency
• System stability improvements
• Bug fixes based on community feedback
• Performance optimizations for general operation

User Experience Improvements

• Faster GPS satellite acquisition
• More accurate fitness and health metrics
• Improved battery efficiency
• Better app responsiveness

Installation Guide

Automatic Update (Recommended)

Your Forerunner 255 will automatically download and install when:

1. Connected to Wi-Fi or your paired smartphone
2. Battery is 50% or higher
3. Update is available for your region

Manual Check via Watch

To manually check for the update:

1. Press the Up button to access the menu
2. Navigate to System
3. Select Software Update
4. Choose Check for Updates
5. Follow prompts if v27.09 is available

Garmin Express (Desktop)

For reliable installation via computer:

1. Connect your Forerunner 255 via USB cable
2. Open Garmin Express
3. Click Check for Updates
4. Click Install for version 27.09
5. Wait 5-10 minutes for installation

About the Forerunner 255

The Forerunner 255 series (released 2022) offers excellent value for runners:

Display Options

• 42mm model: 1.04-inch display
• 46mm model: 1.1-inch display
• Both featuring bright AMOLED technology

Key Features

• Elevate Gen 4 heart rate sensor with solid accuracy
• GPS and GLONASS positioning
• 20+ sport modes covering running, cycling, swimming, and more
• Training guidance with structured workouts
• Recovery metrics including rest requirements

Battery Life

• Smartwatch Mode: Up to 12 days
• GPS Mode: Up to 11 hours
• Ultra Battery Saver: Extended mode for long activities

Why Update to Version 27.09?

Stability

• Ensures consistent performance during training sessions
• Addresses reported bugs and glitches
• Maintains system integrity

Accuracy

• Improves GPS positioning precision
• Enhances heart rate monitoring accuracy
• Better fitness metric calculations

Performance

• Optimized battery consumption
• Faster menu navigation
• Quicker app launches

Update Timeline

Troubleshooting Guide

Update Not Appearing?

• Wait 24-48 hours for phased rollout
• Check your watch region settings
• Try Garmin Express for manual update

Update Fails?

• Restart your Forerunner 255
• Ensure 75%+ battery before retrying
• Use Garmin Express if issues persist

Performance Issues After Update?

• Restart the watch
• Sync with Garmin Connect
• Wait 24 hours for optimization

Conclusion

Version 27.09 for the Forerunner 255 ensures your trusted running watch continues to deliver accurate training data and reliable performance. This update maintains the device's position as one of the best value GPS watches on the market.

Keep your Forerunner 255 updated to enjoy the latest optimizations and bug fixes!