[boredandtattooed]

you dont need to unlock anything... stock, offical roms you dont need to unlock for.. that why we unlock, so we can get things on our carrier dont want us to use.. offical stuff they want us to use, so no unlocking is neccessary.. you should be able to find your stock radio no problem.... but yes u can flash a radio via sd.. the reason you didnt find seperate instructions is because flashing, refers to a process.. the process is the same, whether its to flash a radio or a rom.. when u load it in bootloader it will say Radio instead of OS... flashing radios does not hard reset your device either like a new rom does..

i dunno just some words for ya