Ahmadjon :
You don't have to change BIOS since it works properly.
If your BIOS is set to Legacy+UEFI don't change it, UEFI allows you to use mouse in BIOS and it's way easier to understand what you're doing.
I have dual bios too, there is a cursor but i can't move it.I saw and option for that which says that it only supports ps/2 mice and i have heard that legacy supports ps/2 devices. Does that mean I am in legacy mode?