If the PS3 still asks you to update when you try & play a BluRay Movie & you have installed Rebug CFW 355.2 .? Go into CEX/DEX Rebug selector options & set to -> (REBUG MODE) This will spoof your PS3 to 4.0 . This will get you passed, being blocked & forced to update your firmware & allow you to play you BluRay Movies on CFW 355.. Rebug has its own built in spoof ,as of now it is update 6 & spoofed to 4.0. As long as you install Rebug 355.2 CFW correctly, you should know how it works.
Do not install a stand alone spoof if using Rebug 355.2 .If you are using any other CFW/MFW you can use the 4.0 stand alone spoof for these CFW->AKA-> Custom FirmWares.. If you did choose any CFW 355 remember to flash back to official 355 firmware if you want to update past this = Your choice .there is no going back without a flasher & make the right decision ,stay on CFW 355
OFW -> SUX