Bubble Studio
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Bubble Studio is the first PS Vita app.db editor. It runs entirely in the browser using HTML5 and Javascript.

Bubble Studio requires you to dump your app.db from a Vita system. After loading it in the application, you can change the bubbles' icons, name, bootscreen and overlay. New bubbles can also be added.

Bubble Studio relies on the notorious PS Vita 'e-mail trick' to write files back to the handheld. This application supports PS Vita systems starting from system version 3.15.