To install CIA files on your PSVita, you need to have a compatible firmware version and a working exploit. The most popular exploit for installing CIA files is the Ensō exploit, which works on firmware 3.60 and lower.
Recently, a fan-made English translation patch for Digimon World Re-Digitize Decode was released, allowing players to play the game in English. However, installing the patch requires some technical expertise, especially for those who want to install it on their PSVita using the CIA (CTR Importable Archive) format.
Digimon World Re-Digitize Decode is a fantastic game that offers a unique gaming experience, and the English translation patch makes it accessible to a wider audience. If you're a fan of the Digimon series or role-playing games in general, we highly recommend checking out this game.