Step 1 Turn Saturn Pro off.
Press and hold the MFB button for about 3s until the RED LED light up for 1s. Then goes off.
Step 2 Switch TX/RX button to TX or RX side.
Step 3 Wait for 15~20s.
Step 4 Turn Saturn Pro on again.
Press and hold the MFB button for about 3s to turn Saturn Pro on. Or press and hold the MFB button for 7~10s to pairing mode.
If you want to see the more details, please watch video user guide for Saturn Pro-