Download and install the latest version of Flasher e.g. maemo_flasher-3.5_2.5.2.2.exe Download the latest firmware (.bin) file and save it to %ProgramFiles%\maemo\flasher-3.5\ (the default installation path for Flasher) or to the custom path of your choice. Ensure the battery is at least half full. Unplug charger cable and switch off the device. Open the Command Prompt (Start then Run or Windows Logo key + R) and type cmd then press Enter. Change the directory to the Flasher's path (TIP: Use the TAB key to auto-complete the commands and file-names) cd "%ProgramFiles%\maemo\flasher-3.5" Hold the u key on the keyboard and connect the USB cable at the same time (details on the wiki) Run the following command: flasher-3.5.exe -F RX-51_2009SE_2.2009.51-1_PR_COMBINED_MR0_ARM.bin -f -RReplace RX-51_2009SE_2.2009.51-1_PR_COMBINED_MR0_ARM.bin with the firmware you wish to update. The update will take approximately 4 minutes after which the N900 will reboot and display the Welcome Screen with Regional settings