gs724tv4 bricked?

Hi,

I tried to upgrade my firmware. That wend wrong, so I now am stuck with a bricked switch.

Bricked as in: it does show the leds blinking, I cannot access it via smartcontrolcenter, nor can I use it to get access to the network. 

I managed to get on the internet by patching this computer to my modem directly, but all other stuff is gone...

Oh I tried:

- factory reset by the button on the front (pressing it 10 or so seconds until it reboots)

- resetting it by the button on the front

- resetting it by breaking the powerline

Help!

Thanks,

Ruud