ok i just want my n9 back to life

i have never flashed my n9 manually. is this correct or i forgot sth:
1. download the last 2 files from navifirm
2.turn off the phone
3.type cd C:\Program Files\Nokia\Flasher\
4. type flasher -i
and the next step with replacing i dont understand....will i replace it in the cmd window or where?