the process is simple brother
flash full g900p stock, 4 files is best
go thru setup on the phone
enable usb debugging
then on pc download this file -
https://download.chainfire.eu/408/CF...pr-smg900p.zip
extract and flash this file in ODIN IN THE AP SECTION
it will take a few min to boot its ok just give it time.
after it comes on look for a new app called SUPERSU
when it first opens there will be some ad or something just hit no thanks
then click the settings in the right hand corner of supersu
click DEFAULT ACCESS
change it to GRANT
next open up z3x or octo etc, choose g900p and select domestic unlock
after unlock success flash back stock 4 files