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. You can download the latest HPlus here. http://en.001phone.cn/hplus-f5.html
Actually there is also another way, you can update it manually.
There is a new firmware 1.66 version.
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.