Question: how to program liftmaster g387lm?
Answer: Choose a 4 Digit PIN.
Determine your garage door opener ID. ... 
Make notes of DIP switch locations with the following numerical value. ... 
On the keypad press and hold the * and # buttons at the same time until the backlight on the. ... 
On the keypad enter the 4 digit PIN you chose to open/close the garage door and then press the.