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Hello and welcome, 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.
However, you need to contact our player support to get the purchased boosters back.
If you play on mobile, then please email Player Support directly from the game.
When sending an email directly from the game, Player Support will automatically get your purchase history and all transactions the recent 90 days.
Go to the game's Start Menu, then Settings - Help Center - Purchases & Gold Bars - Contact us and send them an email, or click the link below: