Too many users face the error of “Storage almost full” when they jailbreak the iOS 9 even the available storage is still large enough. Why is that? and how to fix?
This storage error is relative to the system volume, where the iOS is installed into. The caches dlyb files of iOS 9 is seriously big in size.
The solution is using iFile to move LINGUITIC DATA in SYSTEM/LIBRARY to VAR/MOBILE. That will frees up to 450 Mb for the system volume and solve the trouble without any arising problems.