hr zones not sames as my old FR235

Used my FR235 for the last 8 years and the hr zones are set.  I tried to set my HR zones on my new FR 165 with max Heart Rate of 168.  Watch continues to revert to max 150 heart Rate.  I am using an armband HR monitor and all my runs on treadmill show that I am in zone high 3 and 4.  I am running at 125 bpm per minutes. My resting heart rate is 43 bpm.  So the HR zones for FR 165 do not make sense.  How to modify them

  • Hi ! Please check the following settings, and make sure to check your Sport Heart Rate Zones in step number 8. See if your Running HR zones are different and adjust them if necessary.

    1. Open the Garmin Connect app.

    2. Select More (bottom right).

    3. Select Garmin Devices.

    4. Select your device.

    5. Select User Profile

    6. Select Heart Rate & Power Zones

    7. Select Heart Rate

    8. Customize your heart rate zones.

      • Select models will allow you to customize separate heart rate zones for select activity profiles.

        • Depending on your model you may need to first select Sport Heart Rate.

      • Select models will allow you to set heart rate zone percentages to be based on a certain metric.

    9. Select Done.

    Changes will be applied to the device with your next sync. Models that support Real Time Settings will update your setting changes immediately without needing to sync. For more details see Real Time Settings in the Garmin Connect App.