Euromeridian keypad not responding

[Podbrook]

Just reduced the volume on the keypad by pressing and holding D then typing code 2000 to get into keypad menu. Adjusted to volume 1 and the sound reduce as this was completed. Pressed A to save and exit but keypad is frozen and no button works now. I can’t reset using numbers, proximity tag, key fob or app as access is denied. Need advice as to get the alarm working again. Help please. 

[Secware_Tech6]

It looks like you changed the keypad address