via http://ps3.scenebeta.com/noticia/ps2...cs-placeholder

If you 've decided to leave the Custom Firmware 3.55 , this is something you should not miss, because a new features of the Custom Firmware is loading 4.XX games PlayStation 2 without the need for a model of PS3 backward compatibility , do not wait and meet the new you can do with your PS3 in the new custom firmware.