turboshed

Last night i tried to update the firmware on my 2010 A8 MMI 3GP, i started the process after loading the files to a SD card and loading that into slot 1 of the car. The update process started. I left the car to do its thing and went inside for a while. On my return the MMI screen was blank - (this was about 2 hours later as i fell asleep) and nothing seemed to be happening. I tried to reboot the MMI and still nothing

I had a few errors on the dash screen, no phone, no nav etc

Now this morning it like the car is completely dead, no ignition at all. The battery is good though