Why is OH1 firmware version different in Polar Flow?

Platform your question concerns:

[ ] Android
[ ] iOS
[x] Other
[ ] Platform is not relevant for this question

Device:

[x] Polar OH1
[ ] Polar Verity Sense
[ ] Polar H10
[ ] Polar H9
[ ] Other
[ ] Device is not relevant for this question

Description: Polar Flow (Android and Windows) reports an OH1 firmware version of 2.1.20. Running the following Python script using Bleak gives me 1.3.9. Why?

#!/usr/bin/env python3

import asyncio

from bleak import BleakClient
from bleak.uuids import uuid16_dict

uuid16_dict = {v: k for k, v in uuid16_dict.items()}

## UUID for firmware revision ##
FIRMWARE_REVISION_UUID = "0000{0:x}-0000-1000-8000-00805f9b34fb".format(
    uuid16_dict.get("Firmware Revision String")
)

async def main(address):
    async with BleakClient(address) as client:
        firmware_revision = await client.read_gatt_char(FIRMWARE_REVISION_UUID)
        print("Firmware Revision: {0}".format("".join(map(chr, firmware_revision))))

if __name__ == "__main__":
    asyncio.run(main("A0:9E:1A:C4:ED:97"))

polarofficial / polar-ble-sdk

Why is OH1 firmware version different in Polar Flow? #381