As long as you have a working remote you can input a new pin code even if current pin is not known.
Have done a few of these for customers & normally for free.
Instructions are below, please follow correctly & make sure you input digits on the keypad so you see red led flash one time for each press, if you are too slow you will see the red led flash multiple times & will need restart from scratch.
Once done correctly the alarm will chirp to confirm process complete, test you chosen 4 pin code for arming & disarming of the alarm then have a cup of tea, make a secure note of your current new PIN & say thanks ...
Enter new PIN on M30 alarm (1 working alarm fob needed)
- Arm and then Disarm the system using a working Radio Key. - Within 30 seconds of disarming, type into the keypad- *17856*92*wxyz*wxyz# (where wxyz is your new PIN code) - Arm the system with the Radio Key - You should now be able to disarm the system using the new PIN code