it all depends on the firmware of the gadget. I do not think that they will be guided by the old versions, so some devices will be in the off-top
I don't think that it will depend on firmware version that much. Current popular firmware types all have the capacity to run an app like this!
are you serious? it totally depends on the firmware version, and many other programs. If the firmware is old, then the phone will not load half of the modern applications.