Ender 3 V2 BLtouch upgrade issue

Hoping I can get a steer on my problem. No experience with 3D printing, bought a new Ender 3 V2 (4.2.2 MB). I did a couple of prints which were OK. Upgraded ther springs as recommended by a lot of guides then started to have bed adhesion issues due to levelling.

So I bought BLtouch (V3.1, Creality version from Amazon). Installed OK. After several different firmware upgrades, I am still having an issue where the autohome sends the nozzle to the bed but does not stop, continues in to the bed and I have to power off.

Couple of checks I made were to trigger the Z stop to see if that was still active, it wasn't. Put my finger on the BLtouch and it would stop, so it seems to work. However, it just will not auto home without crashing to the bed.

Tried lots of sites and dont seem to have a fix. Can anyone help?