I've bought a Micron Z4120C (panl cover shows 7353) 4-pir alarm system. I've added a backup user code as the user Instructions said "1 2 3 4 then 1+3 together then 1 0 2 0 # then 1 5", but it result in changing the master code 1 2 3 4 to 1 0 2 0.

Because the default code 1 2 3 4 not working again, but 1 0 2 0 can set it armed/disarmed.

 

 

 

When I want to change it again it doesn't work any more, as "1 0 2 0 then 1+3 together" it beeps differently, I've called a technician to came and check, but he can't solve it without the programming manual.

 

 

 

could someone help me to solve this problem? Or how to set it back to factory setting? 

Thanks very much