Polar Electro M400 User Manual page 29

To update the firmware:
1. Plug the micro USB connector into the USB port in the M400, and plug the other end of the cable into
your PC.
2. FlowSync starts syncing your data.
3. After syncing, you are asked to update the firmware.
4. Choose Yes. New firmware is installed (this may take some time), and M400 restarts.
Before updating the firmware, the most important data from your M400 is synced to the Flow web service.
Therefore you will not lose important data when updating.
29