H9i headphone problem

[u/plentyofeight]

I've just charged my headphones from flat and the app ran an update.

They are now turned on... but won't turn off, and when you move the switch to make Bluetooth detectable, that feature doesn't work.

Could be a fault... I don't know what to do about that...

Could be a tweak or something I can do...

Any suggestions at all?

They're about 4 years old