Phone [Q] LG L3 E400 internal Storage

Hello everyone ,i have an Lg L3 with a the Fusion Xperia rom and i am facing a little problem with it capacity , everyone know that the Lg L3's storage is divided up to two parts one for installing apps with a 157 mb and the other one for pictures,videos,musics anything that you want to put on it with a 1 gb .and i know that we can swap external memory to Internal with a folder named vold.fstb i think... but I've tried and it won't work because od permission or i don't know what , and my question is : can we swap the external or the internal memory to the system (the first part ) ?

and thank you for your answers and sorry if i mad some mistakes