If your JBL Flip 4 speaker refuses to connect to another device through Bluetooth, see the [https://www.ifixit.com/Wiki/JBL_Flip_4_Won%E2%80%99t_Connect_Through_Bluetooth|JBL Flip 4 Won’t Connect Through Bluetooth problem page] for possible causes and solutions.
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Try:
a) first uninstall the app
b) go to Settings --> General --> Reset Network Settings
c) completely power the phone off after it resets and reboots
d) download the app again, and try pairing blu tooth from scratch.
Try
a) first uninstall the app
b) go to Settings --> General --> Reset Network Settings
c) completely power the phone off after it resets and reboots
d) download the app again, and try pairing blu tooth from scratch.