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My friend @Flanje has already given you the correct information. In the case of Android and I-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. And the boosters are not refundable.😎
Hi @Annica_Wanselius !
Boosters and Lives are not backed up to Facebook or your King account as the progress and Gold Bars and won't then transfer or sync to a new device when you connect the game to your account.
If you play on an iPhone/ iPad you can do a back up in iCloud and see if you can transfer the Boosters in that way. On Android you can back up the game on a SD-card. However, since these back up systems are not provided by King nor in our control, it's not sure it will work, but it's worth a try if you have loads of unused Boosters stored.