~/Library/Application Support/rpcs3/dev_hdd0/home/00000001/savedata/
If you want the bonus modules (like the extra Miku Append style or unique accessories) that were locked behind that cross-save feature, you cannot simply generate a password. You have to find a save file that has already "unlocked" these items. It turns the save data into a digital artifact of an era where Sony pushed hard for Vita-PS3 connectivity. project diva f 2nd save data rpcs3
To manage your Hatsune Miku: Project DIVA F 2nd save data on project diva f 2nd save data rpcs3