Open box, upgrade, dead watch?

[wibble]

It may just be a connector that needs reseating as a few people found with the devkits. Be gentle with the FPC ones. Screen is the flat one in the bottom left. The FPC above it is the touch sensor, and the one at the top is the heart rate sensor that's stuck to the back of the battery. The battery has double sided tape on the back so lift it carefully to avoid damaging whatever bit below it may be stuck to - there's at least one report of having ripped the accelerometer off the board. I've not tried opening a sealed one, but sealed a devkit with B-6000 glue.
https://wiki.pine64.org/images/2/29/Pine...cation.jpg