If you have two displays, part of the firmware update is to update BOTH displays. The left display is now running v11.0; the right display and all the network devices such as the SV-ADAHRS-200 and SV-EMS-220 (and any other network devices - servos, SV-ARINC-429, etc. are still running the previous version of firmware. Thus the left display "can't talk" to the right display and the network devices, and you see the "Big Red Xs".
Once you update the right display, IT will update the network devices, then your system will be back to normal. If you have Dynon AP servos, make sure those are are getting power before starting the upgrade on the right display.
Just now made the new firmware and got warnings ADAHRS fail and EMS fail. And on the screen two diagonal cross. On the right screen didn't change firmware yet as afraid to stay without avionics at all.