"IMPORTANT: Before updating the earphone firmware using the Melomania app check that your Melomania 1+ are connected correctly.
When correctly connected, Melomania 1+ will show in your device’s Bluetooth settings *MY DEVICES* list as below. In this case, Melomania 1+ L is the primary earphone and Melomania 1+ R is the secondary earphone. They may connect with Melomania 1+ R as the primary earphone and Melomania 1+ L as the secondary earphone, that is fine. You should check that the secondary earphone is powered on, the LED will be flashing white.
If you are using a phone that supports TWS+ then you will see something like this: