JBL Firmware Update 2021 for Bluetooth speakers - YouTube
JBL Xtreme 2 Review: Plenty of power for your summer and more
JBL Xtreme 2 review: A sturdy Bluetooth speaker that's up for serious partying | TechHive
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 2 Portable Bluetooth Speaker Black JBLXTREME2BLKAM - Best Buy
JBL Xtreme 3 Portable Bluetooth Speaker Review - LiquidAudio