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Vita Button Swapper - Vita Homebrew Apps (Utilities)
On Japanese Vitas O is confirm and X is cancel, while the rest of the world is X confirm, O cancel.
To change the confirm button behavior, install the VPL, then open the button-swapper bubble and follow the directions.
Please note that using this homebrew is different from swapping X/O in Accessibility settings > Button Assignment. This homebrew "properly" swaps the buttons, without using Accessibility settings. For more information, check the source code.