i have a PS3 FAT CECH00 i was using ROGERO CFW 4.21 updated from 3.55. Today i have installed E3 CFW 4.30, and works perfectly fine. I just Formated my Hard Drive first because my old installation from 3.55 doesnt works with BD Discs like MW3. Now is all working, and i make and Backup from MW3 on External USB HDD and im playing online all day, Thanks E3 CFW 4.30 and Thanks Rogero for you hard works. No necessary Downgrade to OFW 3.55 just update. My PS3 FAT PSN ID EversonRJBR My PS3 SLIM OFW 4.30 No JAIBREAKED AlexandreRJBR No problem found, and workin in PSN very good. CFW 4.21 Rogero ---------> E3 CFW 4.30 ---------->