Ender 3v2 Z axis and firmware issue

Hello everyone !

I have an issue with my crealty ender 3v2. i updated the firmware, since then i have a Z axis issue and I cannot find the good firmware to install to my printer. i have it since december 2021 and didn’t change anything on it until now.

Also i tried this : https://www.youtube.com/watch?v=CBiTCBVSBdE but it’s not working for me

Thanks à lot for your help