Kobo N204B factory image needed

Hello there,
it seems that my kobo n204b bricked and doesn't boot.

if i try to power it on, the screen flashes black twice and the unit does not respond to the reset to factory defaults button combination.

I've already opened it and imaged the internal sd with win32disk imager and tried to write it to another sd card to test, no success.

Anyone has a stock image to download and try?

Thank you