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your boosters are stored on the device itself so if you change or reset your phone you lose all your boosters but should keep level and gold bars. The lifes are not stored on anything so it suggested you use them when you have them, there is a post that explains about the lives
Hi @llseDR. Welcome to our Community
Boosters are saved directly in your device's memory, which always allows you to use them while playing offline. This also means that if you delete and reinstall the game, then Boosters can be lost and just saved Levels.
It’s best not to store too many Boosters on your device, as there is a chance they may be lost, or affect the game play. and save your game in Facebook and King Account.
Please read links bellow about lose booster!