No firmware update will dramatically increase your speaker’s maximum volume or bass. Those are hardware limitations. Updates fix bugs and improve stability, not transform the speaker.
Press and hold the button and the Bluetooth button simultaneously for about 2 to 3 seconds.
Move your phone closer to the speaker to ensure maximum Bluetooth bandwidth.
PC (Windows 10/11), USB-A to USB-C cable (Xtreme 2 uses USB-C for service).