288w ago - According to
Guy Legend, a busy thread on the
official PlayStation forums which had multiple people stating that the new firmware update for PS3 has killed backwards compatibility with GT4 has been mysteriously removed.
To quote: Apparently on the PlayStation boards there was a thread (which suddenly vanished without a trace) that the new 2.00 update has killed the 80 gb's BC with Gran Turismo 4. Multiple people said that the game would no longer work.
Ugh, anyone here able to try it? I assume if made aware, they would fix this in the next update...
now u cant use jailbreak key dongle , and plz change the eboot and param iso file of ur all game to original eboot, after that u can play the game , b...
Might as well be here 
The new 40GB models do officially have no PS2 BC.
the 60gb pal doesn't have the emotion chip inside so it's also software emulated