Running older homebrew games

[FooAtari]

Are there are a lot of older homebrew games that no longer run on the more recent firmware releases. I have been trying to game some games running on 5.50 GEN-D3 with little to success. Games like Trigonometry Wars and Galactic Breakout

[mikica]

I am playing on the same system version: Cavestory,Times of war,Kitten Cannon,Battlearena,Quake,Doom,Heretic,Hexen,Alex etc.You can find links and tryed games on this site http://advancedpsp.tk/foro_es/viewtopic.php?f=41&t=421&sid=e52dd44600d7ae76252b67db9e1f2b65&start=630