I am having the same issue. the meter will ask me for the firmware update all the time. I have tried new batteries and pressing them for 3s to connect to it, as per the post above. However, my mood meter keeps asking for firmware every time I try to connect to it.

Firmware on meter: 1477971088
New Firmware:1477971088

I am using IOS 14.0.1.

I hope someone has an answer for this.