Nokia announced the Lumia 520 at MWC 2013. This entry level budget smartphone, with an attractively  affordable price tag , broke all the previous records of Lumia with record sales numbers in popular markets. Lumia 520 was a great value for money product, but a small thing that was highly criticized, which applies to all the X20 series phones below 820, the 512MB RAM it ships with. Some apps/games  in Windows Phone store require 1GB of minimum RAM. So despite of having a capable GPU, Lumia 520 cannot run those games.  To overcome this problem, Nokia released a small revision …