http://www.dcrainmaker.com/2012/06/garmin-fr910xt-update-adds-tssifnp.html Изменений куча, вот они все:
Fixed several problems causing shutdowns during biking and running activities.
- Corrected several instantaneous pace calculation issues.
- Major modifications and additions to Bike Power functionality:
- Improved support for power based workouts.
- Added new power metrics (Training Stress Score (TSS), Intensity Factor (IF), Normalized Power (NP), kJ).
- Automatically modify power zones when functional threshold power (FTP) changes.
- Improvements to power sensor calibration process.
- Added support for left right power balance.
- Added support for 3, 10, and 30s power smoothing.
- Improved accuracy of distance calculations for pool swim.
- Rest times are no longer included in the average pace calculation for pool swim.
- Distance alerts for pool swim will now occur during the last length before completing the configured distance.
- Swim distance alert will now reset after pressing lap button.
- Corrected issues displaying history for open water swims.
- Improved calorie calculations during swim mode.
- Corrected issue with barometer calibration improving initial elevation readings.
- Corrected issue where sudden changes in the elevation could be observed on the watch.
- Fixed problem with auto-scroll that could potentially cause a device malfunction.
- Added ability for the user to enter ANT+ IDs for all sensor types.
- Added sensor details page for all ANT+ sensors.
- Prevented HR alerts from occurring when user was in the correct zone.
- Improved accuracy of battery charge information.
- Improved foreign language translations. (список изменений с 2.3 до 2.4 на оригинальной странице)
Обновлять отсюда. Или выбрать в ANT Agent-е "check for software updates", нажав правой кнопкой по нему.