Hi @cathcanlas unfortunately the boosters are saved within your phone memory so when the game data is wiped, the memory on your phone is cleared too meaning they go.
@KristiOrourke it doesn't matter if you don't have an iphone, its not working on an android either sadly.
The good news is the studio are aware of the issue and are trying to fix it, but while you are both here, I see you have both posted for the first time so I would like to welcome you both to the community