Updates & Downloads

Forerunner 645 Beta software version 5.17 Beta

as of April 17, 2019

For any issues that you encounter please fill out the form included in the download and attach it to an email to [email protected] Please note that you may not get a response to the email unless we need more information on the issue you report. In the process of troubleshooting reported issues we may access information in your Garmin Connect account, such as your activity files. More information about Garmin's privacy
In the process of troubleshooting reported issues we may access information in your Garmin Connect account, such as your activity files. More information about Garmin's privacy policies can be found at: http://www.garmin.com/en-US/legal/privacy-statement
Although this software is believed to be reliable, it has not yet been released for production and should be used at your own risk.

Fix an issue that occurred when using the music widget to control music from the phone.

Fixed an issue where the device could crash while using Garmin Pay.
Fixed an intermittent issue where the display length during a pool swim could show invalid values.
Fixed several CIQ 3.0 issues.
Added Galileo Support
Added Color Emojis

Added abnormal heart rate alerts. Enable these in Heart Rate widget > Heart Rate options > Abnormal HR alert. An abnormal heart rate will be detected if your heart rate exceeds the entered threshold for an extended period of time while sedentary.
Correct an issue where CIQ Apps were not properly deleted from device.
Correct an issue that could reset device if using specific text language files.
Updated Translations
Various Bug Fixes

Added Physio TrueUp support. Physio TrueUp syncs activities done on other Garmin devices, allowing your device to more accurately reflect your training status and fitness. Activities from other devices will appear in the Activities menu, and they will update your Totals for Running, Cycling, and Swimming. Your Training Status, Training Load, and VO2 Max will be updated using activities from your other devices, and your Recovery Time will be also updated using data from other devices supporting Physio TrueUp. Enable Physio TrueUp in Settings > Physiological Metrics on the device or in Device Settings on Garmin Connect Mobile.
Added support for REM sleep phase detection and improved the accuracy of the existing sleep algorithm.
New Beta Feature! Extended Display will allow you to display your data screens on your Garmin Edge during a biking activity. Enable Extended Display mode on a supported Edge, and pair it to your watch as an Extended Display sensor.
Updated Translations
Various Bug Fixes

Connect your Forerunner 645 to your computer using the USB cable.
Download and unzip Forerunner645Beta.zip. Click on the Beta folder. Place the GUPDATE.GCD file in the \GARMIN folder of your device's internal storage drive. Place the GUP2887.GCD in the \GARMIN\REMOTESW folder of your devices internal storage drive.
Disconnect your device from the computer, approve the update on the watch, and wait for the update to finish.
If you would like to revert to the last public release software, download and unzip Forerunner645Beta.zip and click on the Public folder. Place the GUPDATE.GCD file in the \GARMIN folder of your device's primary internal storage drive. Place the GUP2896.GCD file in the \GARMIN\REMOTESW folder of your devices internal storage drive. Disconnect the device. NOTE: If you revert to an older version of software, all of your settings will be reset to defaults.