6. How to enter pairing mode in BT mode? How to clear the pairing of RETRO NANO?

Double press the multifunction button to switch working mode to BT mode.
[How to enter Bluetooth pairing mode] (not on the menu page): 
1. If the device is never paired: After the device powers on, it will automatically enter the pairing mode with the display showing “Pairing”;
2. Force the device to enter pairing mode: When the device is in the connecting state, hold the multifunction button for about 5s until the display shows “Pairing”.
Note: When the device is turned on for the first time or after clearing the pairing information, it will automatically enter the pairing mode.
[How to clear pairing]
When the device is turned on, press and hold the volume + button and volume - button at the same time for about 5 seconds.