Did you do a hard reset? Unplug and reboot it?
Is everything but the EB8 working? Did the firmware update change the name of the EB8 unit?
Can you access the setup/web page?
Did you do the firmware upgrade on a wired connection or over wireless?
Take a breath and relax... your tank isn't going to crash in under 15 minutes. Worst case plug things into a regular outlet until you sort this out.