My save is still stuck on the 38/42, but the stars are unlocked as having been earned, and I changed the 01 to the 04 as suggested, but that had no effect. I'm still trying to determine what else needs to be altered to make the actual medals register as earned and then I'd try doing a single race again and getting a medal to see if it pops. But in the meantime I'll upload the save I have so far:
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Again, this is just the hex edited save I did. The four pro medals are still missing.
Edit Update:
Ok, after more tinkering with the hex editor, I've managed to get 2 of the medals to unlock so now it says 40/42. I'll keep messing with it and see if I can get the final 2, which are both the levels in the final Red Cup challenge. In the mean time:
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And if I'm understanding this right the remaining two offsets that need to be adjusted are somewhere around 00020250 and 00020530.