does anyone know where to find code for the bltouch upgrade?

Ender Series Creality Ender-3 Max & Pro & Neo
1

i want to make some edits to the code but creality only has the stock firmware code. do I have to edit the stock code to make it suitable for the bltouch or is the code somewhere online?

2

This page has Ender 3 max/Pro/Neo firmwares with BLtouch don’t know which will suit you.

3

i have the original
but i did not find the forum page for it

4.2.2 mainboard btw