Hello everyone ,

I've tried to follow this guide:
[www.longer3d.com]

But when I reach the point that says "Send M851 Z0 to reset Z offset value"
I just receive:

>>> M851 Z0
SENDING:M851 Z0
echo:Unknown command: "M851 Z0"

I've checked the cable wiring five times and the 3D touch protrude twice when I turn it on and then stays with red light on afterwards - dont know if thats good or bad?

Here's a little info:
echo:Marlin 0.4.0T005-Marlin2.x
echo: Last Updated: 2021-12-28 | Author: Longer3D, Hobi, tpruvot
echo:Compiled: May 5 2022
echo: Free Memory: 2836 PlannerBufferBytes: 1200

Can anyone help me?

You seem to be using 3rd party firmware, not official firmware
Seems to be from [github.com]

So you need to edit Configuration files to enable bltouch and compile and upload

Thanks for the answer @Dust .

I followed this guide and this video and it seems to be working now:
[all3dp.com]
[www.youtube.com]