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If you are looking to play PS2-era titles on your Vita, here are the most effective ways to do it: 1. Official PS Vita Ports ps vita ps2 emulator vpk
The Vita homebrew community has successfully "wrapped" several Android versions of PS2 games to run on the Vita. These require the original Android game files: An enhanced version of the PS2 masterpiece
If you want to play your entire PS2 library on a Vita, the only 100% effective method is . ps vita ps2 emulator vpk
"Play PS2 Classics on-the-go: A Guide to PS Vita PS2 Emulator VPK"