Reset master code on Abacus 8abi alarm system - need factory reset instructions

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I bought a house which has an alarm system integrated. Badly installed, will need a lot of rework. Main issue at this moment is that I don't have the master code. I can get into the engineering menu already, but is not enough.

Does anybody know the exact steps to reset the codes to factory defaults? The steps NO/YES/NO/YES do not work.



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