What you're trying to do will involve modding your phone (which will aslo avoid any warranty you have). THe process in a nutshell would be to use the USB that came with your phone and to flash your phone using your PC and some certain software. the software I use is called 'XS++', but before you go using it, I highly insist you research into what you're doing, as if you mess up, there is sometimes no turning back, and you end up with a very expensive paperweight instead of a phone

.