You must be on version 3.74 to browse, purchase, or download games from the PS Store. How to Download and Install the Update
This is the easiest method if you have a stable internet connection. Open on your PS Vita. Select System Update . Choose Update Using Wi-Fi . ps vita system software update 374 download upd
: If you wish to stay on a lower firmware (like 3.60 or 3.65) while maintaining PSN access, use the HENkaku settings to "spoof" your version to 3.74. Safe to Re-Jailbreak : Version 3.74 is currently jailbreakable using tools like h-encore² PS Vita System Software (US) You must be on version 3
As of the publication of this article, yes. Sony has not hinted at a 3.75 or 4.00. However, they may release another security patch if a major exploit is found. Select System Update