Optima plus 2 lost code?

Hi, we just bought a house fitted with the Optima plus 2 security alarm, I switched the power off to it accidentally and when i switched back on the alarm sounded, I dont know the code to switch it off, please how do i deactivate the alarm, I cant put the electric back on in the house without the alarm sounding, is there a paticular code i can use thank you.
Ian, August 2021


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