We warmly welcome you to the Friendly King Community's Candy Crush Friends Saga forum.🤗
In the case of Android and I-Phone, your collected booster is stored in a specific location in the application.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.
However, there has already been a major thread with Christmas calendar disappeared. Click here to join to main thread.