Kobo N647 eReader blocked

Hello to all,

After a disconnection at the wrong time, or malfunction due to a problem of electrical origin, my Kobo original wifi n647 eReader stopped working.

The device starts but stops responding after the fifth square and freezes completely.
The device is still recognized by Windows XP but the .kobo directory is empty.
The update via the kobo desktop is ineffective.

I am looking, if possible, for an image of the internal µSD card.

The specs of the device are:

FCC ID: NOIKBN647
IC: 8857A-KBN647
MODEL: N647

I think I remember the original firmware to be 1.9.13.

Thank you in advance.:sos:

Best regards from France !