Ideally 3.60 or 3.65 for maximum stability. VitaShell: To move files and access system partitions.
Sometimes the official font package link in the emulator can appear as a page of "corrupt" or "fucked text." This usually happens if a browser (like Firefox) tries to read the binary file as a text file. Right-click the link and select "Save Link As..." ps vita firmware font package extra quality
Search archives for “PSVita extra quality font pack” or check: Ideally 3