I would suggest to try and execute ceemmc -x twice, without restarting the box, eq: you run it once, choose option 1 and follow the instructions. Once it says success, run ceemmc -x immediately again, without restarting the box, this time choose option 4.
Once completed, remove the installation media and reboot from within CE (power menu / reboot).
It it still doesn’t work, I would say, go ahead and re-flash the firmware. There is a link to the latest firmware in my original post.