Apparently, you need all of them incrementally installed. I had my GT5 on 1.09 wich was highest 3.55 allowed. I updated my PS3 to rogero 4.30 v4 just now and patched the 1 GB 2.0 skipping all the patches in between and game won't boot anymore.
I had to go to Game Data utility and delete GT5, now I can play it, but with version 1.0 so I need to download everything. THIS IS MY THEORY THOUGH... so anyone who knows for sure please help and save me the trouble of downloading the ~20 patches GT5 has.
Though judging by op posts 1 Week old, I guess no help will be given.