Nascar Driving School Advanced Daytona question

[awdrifter]

My GT5 is updated to 2.13, and the turning off ABS trick as been disabled. There were mention of turning the ABS to 10 then turn down the brakes to 0, however, that has also been removed now. Does anyone know if the save file will still work if I uninstalled all the updated? I'm thinking about removing all the updated and do this challenge then apply all the updates again. Nascar is such a pointless race, I hate Nascar even more now. If anyone have any other tricks please let me know. Thanks.