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@ksiaze41 in the case of phone, your collected boosters are stored in phone memory. Therefore, they 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.
However, you need to contact our player support to get the purchased boosters back.
Also check this link:
Hi and Welcome to the King 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.
or please report this to our Player Support Team here,