Probaj ono gore
run the windows usb uefi installer again.
press shift + f10; a command prompt windows will pop up.
type 'diskpart' and press enter.
type 'list disk' and press enter.
look for the ssd in the list.
you should see a disk number identifying it.
now type 'select disk x' ; x being the number identifying your ssd. and press enter.
type 'clean' and press enter; this will write a blank MBR.