Allright, here some cheat codes that I had been used:
1. UP0- Upgrade nothing , UP1- upgrade to lv. 1, UP2- upgrade to lv2, UP3- upgrade to lv3
2. These codes 'OUTMYWAY' and 'RESETYA' can be activated by pressing H button (horn).
3. After you finish all the tournament (except the last tournament) you can use the cheat codes by clicking the cheat code view button.