Ive had complete mind block and forgotten my lock code for n900 i have tried and tried.

So now im attempting to flash my device ive downloaded everything i need but when i attempt to flash it doesnt work heres what the command box shows



C:\Program Files\maemo\flasher-3.5>flasher-3.5.exe -F RX-51_2009SE_2.2009.51-1_P
R_COMBINED_MR0_ARM.bin -f -R

C:\Program Files\maemo\flasher-3.5>



i dont know what im doing wrong????