That's worrying.
I seem to need much more volume than those reported here.
An average volume of 90 -100 on 3.0, using an HD558 and M50.
Is this normal?
The total amount of output volume does not change with firmware, as that is limited by hardware. The newer firmware does however give finer control as there are more 'steps' now.
As for how much volume you use, it also depends on your listening habit as well. Are you on high gain?