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Battling to get BLT to work on my Ender 3 V2

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Good day all. I'm new here and I have a problem which is driving me up the walls.

I installed a BLT on my Ender3 V2, but cannot get the thin g to work as it should. The first round I connected the wires to the 5 pin connector and the Z-axis limit switch connector. Then the Z axis would not go down, no matter which firmware I used.

Then someone suggested I connect all the wires to the5 pin connector, which I did. Now the Z axis goes down, so that problem is solved, but now when I home the nozzle, it does not stop. It pushes the nozzle into the bed and I have to cut the power to stop it.

When I turn the printer on, the BLT does a self test as normal but when I home the nozzle, the BLT does not deploy.

Does anyone have any idea what could be wrong please, because I've been at it for two days now and I'm losing my mind?