Repeat the process for the font package. You will know it is successful when a "V" (check-mark) appears next to both the "Firmware" and "Font" indicators in the setup menu.

How to Install VITA3K in 5 Minutes! (PS Vita Emulator Full Setup)

An additional firmware update file—often specifically named PSP2UPDAT.PUP —that contains the actual system fonts used by the Vita.