Touch Kobo Tough died after upgrade

Hello,

I have tried to upgrade my Kobo Tough to 1.9.16 and the device is showing a black screen with "Restarting" in six languages and does not respond to anything anymore.
I have looked at my possibilities and found a SC card and made an bootable Linux usb (ubuntu 12.4). I have loaded the SD according instructions found in one of the forum posts but still no response other then the green flashing light.

I think the SD card is formatted and a partion is created (etc3) but this makes the SD not bootable.

Anybody any suggestion, idea's or instruction how to do it better ?
Has my Kobo died if it totally not responding to resets from the front and the rear ?

Thanks,
Jan