we can't change its RAM
.
about software (firmware) update, I still haven't done it.
I have got number of the guy who does it. but I have been super busy lately so that has a low priority tag on my TO-DO list

I will share it when ever I do it.
How ever, mine used to gets stuck
and that was because of rear screen broken.
I have disconnected rear screen now and since then it has not stuck ever again.