Download [updated]: Psp2updat.pup

Use (better than official CMA) → “Refresh database” → “PS Vita Update”

: The Vita3K emulator requires you to install the PSP2UPDAT.PUP (along with a system font package) to simulate the Vita’s system environment. Psp2updat.pup Download

Depending on where you download the update, the file may pull from the servers with different names: Use (better than official CMA) → “Refresh database”