You installed a corrupt or incompatible font package. Boot into Safe Mode:
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Copy the entire factory font folder and save a backup copy securely on your PC or external storage. ps vita firmware font package
Incomplete firmware installations can lead to instability. How to Install the Font Package in Vita3K
It is usually downloaded alongside the main PlayStation Vita firmware ( PSVUPDAT.PUP ) and installed via the emulator's initial setup wizard. You installed a corrupt or incompatible font package
Disclaimer: Modifying your PS Vita’s firmware voids your warranty and carries a risk of bricking your device. This article is for educational purposes. Always backup your data.
If you're having trouble downloading the package, some browsers may incorrectly display the file as a page of text (due to a text/plain How to Install the Font Package in Vita3K
To understand the font package, you must first understand the Vita’s firmware architecture. The PS Vita runs on a proprietary operating system called Vitashell (not to be confused with the file manager). The system font is stored in a specific partition of the internal storage or memory card. This font file ( ltf0.ttf or similar variations) is what renders all system text—from the Settings menu to the LiveArea bubbles and even in-game text overlays for native apps.
Keep a verified copy of the original factory firmware fonts backed up on your PC.
Launch the configuration application on your Vita, select your font, and reboot the system. Method 2: Manual Replacement via VitaShell (Advanced)
If your Vita fails to boot after a manual font swap, the system cannot read the new font package (likely due to incorrect file formatting or corrupted files).