i read solution about corrupted game here. but its doestn't work in my psp 2000 slim. iso &cso cannot play. also not boot recovery. not also for pandora and magic card. even L&R all together pwr on then square. when i press select in xmb mobe nothings happen but it can reset setting by hard reset with combo trgger. it begin corrupted when i use isotool1969 and i updated the cfw to550 my former fw is 500.m533-6.kindly help,tia