Changes

Basically, all All fat models are downgradable, if . If you have a [http://www.ps3devwiki.com/index.php?title=Flash_%28Hardware%29#NAND NAND] model (CECH-A to CECH-G) use Teensy++ and if you have a [http://www.ps3devwiki.com/index.php?title=Flash_%28Hardware%29#NOR NOR] model (CECH-H to CECH-Q or any downgradable slim PS3) use E3 Flasher. For downgrading I suggest you should follow a tutorial: [http://www.ps3hax.net/showthread.php?t=39766 Using Teensy++/Progskeet] or [http://www.ps3hax.net/showthread.php?t=33989 Using E3 Flasher]

Also, once Once you are on FW 3.55 you'll have to enter Factory Service Mode, to do that either [http://www.ps3hax.net/showthread.php?t=33989 follow this] (see Chapter 2, Part 1), or use one of [http://www.ps3devwiki.com/wiki/Talk:Downgrading_with_PSgrade_Dongle these devices].

You can connect to PSN while on CFW, but there is a high risk that your PSN ID and Console ID will be banned. There is a way to unban your a console though... it It requires someone else's Console ID and if that gets it can be banned too, you'll end up banning them.

And as As for emulators, [[RetroArch]] has a PS3 port, so I'd try that it out.

Also you You can [http://www.ps3hax.net/2013/03/released-beta-ps2-classics-manager-v1-00-20130324-cex-340-4xx/ emulate PS2 games on PS3], any model PS3, however the emulator was never fully completed (it's Sony's own, they gave up on a full PS2 emulator for PS3 and instead now repacking PS2 ISOs with a modified version of the emu for $10 on PSN) so not all games work. [http://www.pshomebrew.net/wiki/PS2_Classics_Emulator_Compatibility_List Check the this list for games that do work].