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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!👇️
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In the case Phone, your collected booster is stored in phone memory. This stored booster can not be synced with the server, because the game studio still does not have this process.You will not be able to transfer the boosters to another device, you will lose the complete booster for app uninstalling or crashing.
Since boosters are stored locally on device memory, we cannot guarantee that your boosters are secure.
However, Please check HERE.