[Q] Android Architecture showing Firmware Boundaries topic

Hi
I have seen nice pictures, layerd diagrams of the Android system. What I miss on allthis diagrams is a boundry defining the components in this layered architecture diagram belonging to a firmware upgrade, i.e. JellyBeans to KitKat, which has recently turned of our WLAN capability. Now we look to find a way back to Jelly Beans.

Can you provide such a layered architecture diagram in XDA forums / documents ?

Josef