Should we still stay at 5.05? Can't install a backported game :/

Hello guys!
I don't know if it's still "recommended" for us to stay at 5.05 since we now can jailbreak the console up to 6.72.

But i'd rather still stay at 5.05 since it have been working good so far!

Anyway i'm asking since i just tried to install a game, but whenever it finishes, i always get these popup:
https://i.imgur.com/uN3HNnC.jpg

And when i try to launch the game, this shows up
https://i.imgur.com/Q2KKTub.jpg

Does anyone knows why this happens?

I'm...

Should we still stay at 5.05? Can't install a backported game :/