Hi,
I recently bought a house with a Aritech CS250 installed, I want to change the user code but don't have the engineering code. The Aritech default (1278) doesn't work

The company that installed it (Lawless) aren't reachable and don't seem to be in business any more.
Is it possible to reset the engineering code? Or do I have to get someone to completely flash/reset the system?
Thanks,
Hugh.