Hi Guys,
It seems that our little Explore 2 got multi-band support somewhere along the way :)

I'm currently on 20.07 beta firmware and got 5/5 bars sitting at my flat. Pretty impressive
There’s already a thread discussing this:
Still don’t know whether or not it’s a really usable feature.
So probably there's no HW for it, otherwise why wouldn't it be there from the 1st day. It's not like ECG that needed approvals before activated. Many other devices, even watches have this feature. So probably it was just a badly configured build :(