This method is possibly the best way to soften boba since it re-creates the same fresh boba recipe.
If you’re unable to make the sugar syrup, using hot water in a microwave is a good substitute
Boba, consists of tapioca flour and sugar. Since boba is mainly made of starches, boba is soft when it’s warm but, as with all starch, loses its softness when it becomes cold.
Boba hardens once it gets cold. The best way to keep boba softened for as long as possible would be to keep it as warm for as long as possible.