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Boosters are saved directly to your device's memory, therefore they will be lost when deleting and reinstalling the game or resetting the device.
Boosters can also sometimes be lost with an update of either your device's operating system or of the game itself. They can be lost because the device is an older model and no longer fully compatible with our games, or, after many technical issues that can occur in the game or on the device you play on.
I sent you some new Boosters. They will pop up when you open the game on your mobile!