first, you need the 17thing certificate by following instruction below.
then download helloOX and signed it with 17thing certificate then install to your phone.
then run HelloOX.
then delete HelloOX and run ROMPatcher and apply open4all patch.
ENJOY!! install any application without any problem.
To Install n-gage hack games, just apply the open4all patch then disable the patch so you can play the game..PEACE