Excuse me, I have some trouble with plugins also, but I don't want to make a new thread, so I will post here.
Actually, the only game which I can use plugin on my PS Vita right now is Steins;Gate (VT 2.0), so I guess there's no problem with game.txt settings, right?
For the rest (all is mai dump), I can't activate any plugin in-game. I tried to change mode 5, 6 or 0, I also tried to rebuild database but still no success. I'm using Vita 1k EU 3G edition, is someone have the same situation?
====
tl;dr: On my PS Vita right now, I can use plugin for Steins;Gate VT2.0 only but it doesn't work for the rest (maidump). Already changed mode, rebuilded database. So how to fix it? Thank in advance.