How to Factory Reset the C51
Step 1: Plug the C51 in.
To power on the C51, plug it into the device you would like to stream audio from (eg. Samsung phone, Nintendo Switch, etc.). Upon being plugged in, the LED on the C51 will turn on.
Step 2: Set the C51 into Pairing Mode.
Long-press the black MFB on the C51 until the LED is flashing BLUE & WHITE to set the C51 into pairing mode.
Note: If this is the first time you are using the C51, it will automatically go into pairing mode upon turning on/being plugged in.
Step 3: Reset the C51.
While the C51 is still in pairing mode, double-click the black MFB. The LED will light up BLUE & WHITE simultaneously for a second or two then return to pairing mode. Now the C51 has been reset and you are free to pair it with any of your Bluetooth devices.