Hello DeVro528,
More than 6 monthes that this "Locked Boosters' problem" has been reported to King but it seems that king's Developper dont do anything to solve it!
If you have the same problem I had, you shoud try what I've already written:
From the device you use to play, load the game then login to King. If you dont have a King's Account yet, you have to create one. Once logged, a game's backup is done automatically.
Exit the game and go to Parameters icon of your device. Go to Applications' Manager then scroll to Farm Heroes Saga and delete Cache memory and remove all parameters.
Go back to the game but Don't play. login again to King. It should restore the Level number that has been backuped at point 1.
For more details please check the message I've posted on:
https://community.king.com/en/farm-heroes-saga/discussion/307367/all-boosters-are-locked/p4
I hope it will help you, Regards