Brewology

Do you have to use Jap or imported Games(ISOs) On Jap PSP with 3.40 OE-A?

Any should be fine, just make sure to use the region override in recovery mode. There are some compatibility issues with some games, but for the most part it shouldn't present a problem I don't think - as long as you know how to read the other languages or the games have options to change the language

-DarkPacMan77-