download odin download your
phone firmware download twrp and super su noting from google start phone in download mode put firmware in ap selec delet all and push start
after reboot do noting restart phone in dowload and put wrp in odin click bl and put twrp after reboot do noting reboot phone...
i have samsung s6 i root my phone with all the above and evry time i look inside with x-plore i see all the file
inside and when i look with twrp terminal i see theme again and when you delet theme even use the stop update
then if i succed the phone wont reboot its all 3 party sofware make you...