like this.. flash fiaco first

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 device keyboard and connect the USB cable at the same time (see the Flasher documentation)
Run the following command:

flasher-3.5.exe -F RX-51_2009SE_2.2009.51-1_PR_COMBINED_MR0_ARM.bin -f

Replace RX-51_2009SE_2.2009.51-1_PR_COMBINED_MR0_ARM.bin with the firmware you wish to update (The name of the firmware image file you downloaded in the beginning).

then flash eMMC
Grab the Vanilla eMMC image (.bin file) from the Nokia repository
Navigate to the directory where the image file was saved (Windows users: if you don't know the full path to the image, copy it to the flasher directory)
Execute the following command

flasher-3.5.exe -F RX-51_2009SE_1.2009.41-1.VANILLA_PR_EMMC_MR0_ARM.bin -f -R

Text similar to the following will be displayed on the computer:
flasher v2.5.2 (Oct 21 2009)

Image 'mmc', size 241163 kB
Version RX-51_2009SE_1.2009.41-1.VANILLA
The dim Nokia screen will be displayed for a few seconds followed by progression dots. Text similar to the following will be displayed on the computer:
USB device found found at bus 001, device address 006.
Found device RX-51, hardware revision 2101
NOLO version 1.4.13
Version of 'sw-release': RX-51_2009SE_1.2009.42-11.002_PR_002
Booting device into flash mode.
Suitable USB device not found, waiting.
USB device found found at bus 001, device address 007.
Raw data transfer EP found at EP2.
[writing 74 % 179200 / 241163 kB 13180 kB/s]
Image(s) flashed successfully in 26.848 s (8982 kB/s)!