We would like to welcome you to the king community. Thank you so much for being willing to joining😊
The problem with Fantastic 5 is still going to be solved and it will be resolved very soon.
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.
Feel free to contact us again if you have any troubles or questions 😊