p0 boot option

Dear hackheads, Since installing Win8 on a different SSD my system wont boot into UEFI:M4anymore. If I select P0:M4 it does work. The problem is that in my bios I can only select UEFI:M4 and not P0:M4 as a boot device. This means that every time I turn my system on I have to hammer F12 so...