It looks like the firmware updates so far are minor. From the notes these are the fixes:
1. Adjusts Insta-Fire. I think early Polars had a power spike this fixes.
2. Fixes Auto Mode A from blinking.
3. Fixes trouble updating firmware.
https://cdn2.hubspot.net/hubfs/2191257/downloads/Polar_20180802.zip
By the way, the firmware works fine on a Mac running Windows.
1. Adjusts Insta-Fire. I think early Polars had a power spike this fixes.
2. Fixes Auto Mode A from blinking.
3. Fixes trouble updating firmware.
https://cdn2.hubspot.net/hubfs/2191257/downloads/Polar_20180802.zip
By the way, the firmware works fine on a Mac running Windows.