Garmin has released the first beta build for the Forerunner 255 and Forerunner 255S, which is also available for their corresponding Music variants. Rolling out as Beta version 12.20, the Release Candidate build contains several new features, improvements and bug fixes.
Garmin Forerunner 255/265/955/965 Get Slate of New Features in Beta
Garmin Forerunner 255S GPS Smartwatch
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Garmin Forerunner® 255S Music
Garmin Forerunner® 255S Music
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Garmin Forerunner® 255S, Smaller GPS Running Smartwatch, Advanced Insights, Long-Lasting Battery, Powder Gray , 41 MM : Electronics
Garmin Forerunner® 255S, Smaller GPS Running Smartwatch, Advanced Insights, Long-Lasting Battery, Powder Gray , 41 MM : Electronics