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Made by Garmin · firmware
The Garmin Forerunner 255 Series includes the 255, 255S, 255 Music, and 255S Music running GPS watches with up to 14 days of battery life and multi-band GPS support. They feature HRV Status, Morning Report, and optional onboard music storage.
Product released: June 1, 2022
Version 29.05, released August 1, 2026
Last checked for updates: Sep 17, 2026 03:32 UTC
LatestUpdate has tracked 10 versions of Garmin Forerunner 255 Series firmware, released between February 20, 2025 and August 1, 2026.
A firmware update is expected soon, between September 2, 2026 and November 1, 2026.
Garmin typically releases firmware updates for this product approximately every 76 days.
Official Garmin Forerunner 255 Series product page
The Garmin Forerunner 255 Series includes the 255, 255S, 255 Music, and 255S Music running GPS watches with up to 14 days of battery life and multi-band GPS support. They feature HRV Status, Morning Report, and optional onboard music storage. It was originally released on June 1, 2022.
The latest firmware version of Garmin Forerunner 255 Series is 29.05. It was released on August 1, 2026.
To update the Garmin Forerunner 255 Series firmware, download the latest version (29.05) from Garmin's website. Follow Garmin's installation instructions, which typically involve copying the firmware file to a memory card or connecting via USB. You can download the latest firmware from Garmin's support page.
Details and download instructions for the latest Garmin Forerunner 255 Series firmware (version 29.05) are on Garmin's official release page: https://support.garmin.com/en-US/?faq=mDOQVSNIu36T6OddCKL4k9
You can track Garmin Forerunner 255 Series firmware updates automatically on LatestUpdate.io. We monitor Garmin's releases and notify you when new firmware versions are available, so you never miss an update.
We have tracked 10 firmware versions of Garmin Forerunner 255 Series. Based on historical patterns, updates are released approximately every 76 days. Garmin releases updates to fix bugs, improve performance, and add new features. Track this product on LatestUpdate.io to be notified of future releases.
Based on this product's update history, a firmware update for Garmin Forerunner 255 Series is expected soon, between September 2, 2026 and November 1, 2026. Track this product on LatestUpdate.io to be notified when it's released.
Yes, Garmin Forerunner 255 Series received a firmware update within the last 3 months. The most recent version is 29.05.
Garmin Forerunner 255 Series is manufactured by Garmin. Visit the official product page for more information.