GitHub - pembem22/connect-plus: An Android app to connect and configure JBL Bluetooth speakers with additional functionality like flashing custom firmware and stereo audio playback with different speaker models.
Was there ever a model of the JBL Charge 3 without JBL Connect? This video has a very oem looking JBL but with no connect plus, also some of their other videos
JBL Charge 3 Firmware Update Instructions | Tom's Tek Stop | Jbl charge, Firmware, Jbl speakers bluetooth
Easy Ways to Connect a JBL Speaker: 4 Steps (with Pictures)
How to connect JBL speakers together
JBL's PartyBoost is why I'll never buy another Bluetooth speaker - Android Authority