i installed 4.30 CFW (clean from recovery) yesterday... it asked me to download some psn software update first (my guess is it was the recent changes they made to the interface) now it says error accessing psn network (not the exact message)... please press ps button to quit...
dont go near ofw 4.30 from cfw 3.55 if its kmeaw you can update straight to rogero cfw 4.30. follow the instructions in the rogero download or on the download page. if you use ofw 4.30 your ps3 is no longer jailbroken or possible to jailbreak without hardware flasher.
as for the 3.55 games with fixes, delete the gamedata not the savegame, and reinstall the game from backup and it should play fine
ah oki thx for the information guys ^^, but looks like i have to stay first at 3.55 because there are some DLC which i used the ReAct PSN will not work, i dont know if this affect for the other DLC in some games or my Dreamy Theater Project Diva... >.<