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Welcome to the Friendly King Community.
If you have previously saved the game on Facebook or Kingdom, your game progress is safe and you will get back game progress by logging in to the game again on any device. If you have not previously linked the game through any account, your game progress will be completely lost for app uninstalling.
On the other hand, boosters are saved directly in your device's memory, which always allows you to use them while playing offline. However, as they are saved directly to your device, by deleting and reinstalling the game then the boosters can, unfortunately, be lost.
I hope I've answered your question in detail and let us know if you have any further questions😊
Thank you!
Unfortunately boosters are connected to your devices memory. Which means if that data is lost, so are your boosters. However, I will point out that if you get a new iPhone and transfer data from an old phone to your new iPhone, your boosters actually stay in tact. I've done this before :)