Here's actual firmware and graph of the xtreme 3, any other old graphic with previous firmware is not anymore (specially when new xtreme 3 comes with 0.2.0.4) : r/Bluetooth_Speakers
JBL Xtreme 3 | Portable waterproof speaker
JBL updates its portable speakers with fresh look and USB-C | Mashable
My new JBL Xtreme 3 turns off during firmware update from 0.1.3.0 to 0.1.8.8 on JBL Portable 5.4.25 : r/JBL