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Updates & Downloads

Forerunner 55 software version 4.00 Beta

as of September 20, 2021

Download (10.10 MB)

View installation instructions


Change History

Changes made from version 3.03 to 4.00:

Changes made from version 2.09 to 3.02:

Installation Instructions

  1. Connect your Forerunner 55 to your computer using the USB cable.
  2. Download and unzip Place the GUPDATE.GCD file in the \GARMIN folder of your device's internal storage drive.
  3. Disconnect your device from the computer, approve the update on the watch, and wait for the update to finish.
  4. If you would like to revert to the last public release software, place the GUPDATE-303.GCD file in the \GARMIN folder. Rename GUPDATE-303.GCD to GUPDATE.GCD before disconnecting your device. NOTE: If you revert to an older version of software, all of your settings will be reset to defaults.