I've recently undergone the SSU update as well.
Since then my N810's WiFi is dead. Funny thing is though that nothing thats been suggested here seems to work.

I can start the device with ifconfig wlan0 up, but it wont connect. Sadly I didnt have iwtools installed.
I have reflashed a few weeks ago and not installed any weird tools and no weird repos. Everything that I've installed since the reflash I did through the app manager.
I cannot even connect through bluetooth any my cellphone.

Any clues other than reflashing?