As you know, how to update the F5 firmware, simply you can go to the HPlus –>Mine –>Firmware version, click it you can update to the latest version.
Actually there is also another way, you can update it manually.
First, download the app/firmware here. (The firmware is encoded as an application)
Second, install and open the app(dfu).
Fourth, find the correct Bluetooth address and connect it. (if your watch is bricked, the device name is started as D_)
Waiting for the update process to 100%, if firmware updated successfully, the watch will vibrate and a message ‘the firmware uploaded to the device successfully’ will pop up in the app.This version is the latest one, there is a important update in the GPS sports training section.
Just install and find it by yourself, personally I think this update is very useful.