We’re sorry to tell you that formatting will clean all files including data of GalleryVault.
Did you back up your files or copy it to P.C?
If you did, please restore it.
If you did not, we are sorry that we are unable to help to get files back.
To make sure security of your own private files, we cannot have the right to back up your files in our server.
If you want to uninstall the app or format the phone, please remember to unhide the files and back up in advance.