Unfortunately the GT Race saves were lost as well, so a couple of weeks ago I redid the series and made my own save.
This save will unlock
Prancing Horse and
GT Race Series Star. In order to unlock both trophies, you have to win the second day on the last GT Race circuit.
Download the save
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Cheers,
Saboteur
PS: Don't forget you need to win a race in this series by yourself first for the
First GT Race Series Win trophy, otherwise this won't look legit!