How to reset CMOS


I’ve here a Notebook it’s called “Poly nuclear series PC” so far I can identify. After I configured the BIOS settings the display is not starting. I want to reset the BIOS settings and looked for the CMOS battery but can’t find. I’ve already tried to remove the cable of the Notebook battery but this has also not works.

Can someone explain me please how to reset the damn BIOS please?

Best regards