Yeah, I know it's old, but I want to have all 3 vettel challenges on my channel. You can also use this glitch for the a-spec Suzuka endurance race.
The glitch only works with update 1.10 hence you have to downgrade if you want to use the glitch and before I receive another million questions on how to downgrade here is how it works:
Delete the GT5 game data in the game data utility folder on your ps3 and then start the game. Now download and install all updates up to the sixth one which is 1.10. As soon as update 7 starts (got 62 MB) press the circle button to cancel. That's it.
Keep in mind that you lose everything that is saved in the game data (pictures, replays and thumbnails). No need to say that you can't go online with GT5 if you play on an older version.
Always keep a backup copy of your savefile on a USB-stick just to be on the safe side.
GT5 update history:
1) 608 MB = 1.05
2) 301 MB = 1.06
3) 47 MB = 1.07
4) 1763 KB = 1.08
5) 48 MB = 1.09
6) 380 MB = 1.10
7) 62 MB = 1.11
8) 13 MB = 1.12
9) 1149 KB = 1.13
10) 1192 MB = 2.00
11) 112 MB = 2.01
12) 246 MB = 2.02
13) 225 MB = 2.03
14) 79 MB = 2.04
15) 25 MB = 2.05
16) 475 MB = 2.06
17) 2193 KB = 2.07