Please help me gs7 root problems

[paul harries]

1. Hello
   Guys please help me im a idiot. i am a complete beginner and like a fool i thought just after some light reading i could root my s7 g930fd i attempted a CF auto root and was going ok. got the green light with PASS. but the phone didnt reboot and just has a black screen with white samsung flashing. The only thing that i can do is put it back into download mode. dont know if i should of but i done it again making sure the auto boot and timed boxes were checked and same result.
   Please help, any help given please treet me like a 4 year old when talking about files and zips and anything else.
   Thanks,
   Paul the idiot in Thailand
   .