@domilito how much is battery voltage? was it charged before you took it apart?

I would like a better quality picture of the board to have an idea on the easiest way to connect the antenna

Modern iPhone or hi-end Android with good lighting is good, focused on the bluetooth module (where it says ILT245s)

@tomfoolery the bluetooth module soldered on the controller board is almost touching the metal plate that closes the box, that blocks the RF (it is surprising that it still works).

An external antenna is possible and I guess it will increase range and reliability enormously. (can be a 1/4 wavelength sized small piece of wire)

Hi all, I found out what the Bluetooth problem is, anyone has a XR controller board on their hands?