as long as you have the ios present a game should work...(only if the game doesnt work gives black screen you should update the ios game uses)As a rule, an existing IOS will never have new features added to it, to protect binary compatibility. This means that any updates for existing IOSes are only meant to fix bugs -- generally, security bugs.
if you do want to update do not patch all ios.
ios36=Trucha Bug ES Identify NAND Access
and do not touch system menu ios....