Nokia N900 - Windows firmware upgrade via flash tool,
I downloaded the firmware, installed the flash tool, put the firmware in the same directory as the tool and then run the folowing command

C:\Program Files\maemo\flasher-3.5>flasher-3.5.exe -F RX-51_2009SE_3.2010.02-8_P
R_COMBINED_MR0_ARM -f -R

and I receive this message

flasher v2.5.2 (Sep 24 2009)
RX-51_2009SE_3.2010.02-8_PR_COMBINED_MR0_ARM: %m
C:\Program Files\maemo\flasher-3.5>

The phone is connected via USB and I have pressed the U button before pluging it in untill I get the nokia logo on screen