Tamper circuit has been tripped on optima rf system, how do i reset it?

Tamper circuit has been tripped on optima rf system, how do i reset it

Bit of history, my future brother in law took the front access panel off this i take it has triggered the tamper switch inside, so now internal alarm sounds and external sound for 20 mins. I have removed mains fuse a disconnected battery at +ve terminal, how do i go about reseting the panel. Will we have to set all the zones up again and exit times etc, hope someone can help

Regards

Chris