Marantec Garage Door Code Change

What do i have to do to make my garage safe again.
Marantec garage door code change. The pin code on this device can be changed by following a few simple instructions. Here are the steps you need to take to change the 4 digit pin code on your marantec m3 631 wireless keyless enty. If you lose a hand transmitter it is safer to delete the tra. Note you need to know the existing 4 digit pin code to make these changes.
If you have an older garage door that is only operated by a remote you must. For marantec eos m4500e m4700e and m4900e garage door openers. Newer garage door openers have a keypad in addition to the remote which makes it slightly easier to change the code. Press and hold the 0 button on the keypad for about 3 seconds until you see the red led on the keypad blink rapidly release the 0 button when led.
Facing the back of the garage door operator the serial number can be found the right side of the chassis. The marantec wireless keyless entry pad is a device that you can have installed with your garage door opener to allow you to type in a pin code to open the door.