After downgrade to 1.6.5 Build 20241231 Rel. 41802 everything works fine, i got AP mode and white light. Mesh works fine too.

@Adrz If everything is ok and works, don't do any upgrade. I bought two M4 and made a mesh, main unit works in AP mode, and after upgrade to 1.8.2 i got red light all the time. Downgrade to 1.8.1,...