Well one of those cables have a green , so one must be 6 core …..find the cable at the control panel end and see if there’s spare green and white
The thought has gone through my head as well as we have 7 wireless ones as well and they were A dream to instal.The problem you have is proving the cable and the joints are poor.
What about fitting wireless expander unit and fit wireless PIR'S in new positions.
Looking at the the old PIR'S they need replacing anyway.
They are brand new but the one in the corner is an old one but looks like they used as a junction boxThe problem you have is proving the cable and the joints are poor.
What about fitting wireless expander unit and fit wireless PIR'S in new positions.
Looking at the the old PIR'S they need replacing anyway.