Resetting the PIN Code linked to your Siren + Keypad is as follows:
1. Open the Kangaroo App
2. Go to Settings
3. Click on My Account
4. Change your PIN code
Take note that resetting the PIN Code is different with resetting your Siren + Keypad. In order to test your new PIN Code if it's working or not, kindly try arming and disarming your Home. Resetting the device and typing in your new PIN Code may also be another way to test it.