@Qwertypoi The bluetooth low energy on the Jelly Pro works just fine.
I noticed in your photo that “force G5 to UI thread” is checked. It should not be.
When you check xDrip+ status page you can see if the transmitter is connected.
Before anything is changed in xDrip+, before any settings are made, you should run the data source wizard. Any change you made should be undone to return xDrip+ to it’s first-run state, then run the connection wizard like it’s the first thing you did after the initial install.