Access the Service menu by typing the following into you phone:
> * < < * < *
(where > is the right arrow and < is the left arrow)
Once in the Service menu, select the following menus:
<Service Info> <SW information>
> I've surfed the menus, read the manual, and called a firmware shop,
> and nobody can tell me how to discover what version of firmware I've
> got on my R520m. Anyone got clue for sale?
>
> Thanks,
> Dave