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Updates & Downloads

Forerunner 945 software version 3.77 Beta

as of December 4, 2019

Download (22.73 MB)

View installation instructions


Change History

Changes made from version 3.30 to 3.77:

Changes made from version 3.08 to 3.15:

Changes made from version 2.80 to 3.08:

Changes made from version 2.70 to 2.72:

Changes made from version 2.50 to 2.64:

Changes made from version 2.40 to 2.48:

Installation Instructions

  1. Connect your Forerunner 945 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. In Forerunner945_377Beta, go to the RemoteSW folder. Place the GUP3114.GCD and GUP3303.GCD file in the \GARMIN\REMOTESW folder of your device's internal storage drive.
  4. Disconnect your device from the computer, approve the update on the watch, and wait for the update to finish.
  5. If you would like to revert to the last public release software, place the GUPDATE-330.GCD file in the \GARMIN folder. Rename GUPDATE-330.GCD to GUPDATE.GCD before disconnecting your device. To revert the RemoteSW, place the RemoteSW\Downgrades\GUP3114-270.GCD and RemoteSW\Downgrades\GUP-3303-430.GCD in the \GARMIN\REMOTESW folder. NOTE: If you revert to an older version of software, all of your settings will be reset to defaults.