change win product keys

Hi 

I have Dell Inspirion 13 7000 - with per-installed win 10 home.

I bought Win 10 Pro that i must install on the laptop - but during installation of PRO verrsion it activates the home version and doesn't allows me to change the product key.

How to change the product key - i think it is somewhere in the bios / uefi firmware ?

how can i install my WIN 10 PRO on this laptop.

BR