Ender 3 bltouch auto home not working

What is the problem?
when i auto home my ender 3 it goes to the corner like usual but it fucks up the z axxes. idk what to do, i needed to replace the z with the one from bltouch so why doesnt it work?
What did you already try to solve it?
ive alreaddy updated the firmware, now it looks like some heavy hacker shit...thats a problem too...
Additional information about your setup (OctoPrint version, OctoPi version, printer, firmware, what kind of hardware precisely, ...)
ive got a normal ender 3 without any mods, bought an bltouch kit with an 'isp usb thing' i couldnt find the links of the firmware so i downloaded idk with one from the creality website for ender 3... it works...ive installed the bltouch and the sensor gives a red light and when it turns on it clicks a few times...