cd "%ProgramFiles%\maemo\flasher-3.5" flasher-3.5.exe -F RX-51_2009SE_20.2010.36-2_PR_COMBINED_MR0_ARM.bin -f flasher-3.5.exe -F RX-51_2009SE_10.2010.13-2.VANILLA_PR_EMMC_MR0_ARM.bin -f -R
after these steps. . i have a fully formatted mass memory and a clean n900 completely reset. . .