Touch Kobo Touch bricked with the screen "Restarting"

Hi guys.

Kobo Desktop doesn't recognize my ereader, but my computer shows the main/external card sd. So i copied the upgrade files in the .kobo folder and unplugged the device. The e-reader at this moment is frozen and just shows the text "Restarting" in different languages. I was read many topics of this forum and i tried so many times to do a hard reset with multiple button combinations without success.

Right now my kobo has the following conditions:

• My device is fully charged
  When I do a factory reset with the device on, the led is red and nothing happens.
• The computer doesn't recognize my device.
• This model has the main memory sd embedded into the device.

Also I wrote to the seller for technical support, but he said the same in this forum.

Thanks in advice.