Si borras archivos del sistema podrias tener algun problema, y si borras acoustic logicamente quedara mudo alguna funcion a la que pertenezca el acoustic, pero se soluciona con un full flash.
Es decir, con subir unos acoustics se soluciona el problema. Sobre el usuario que pidio el parche para "ver" la carpeta, solo aclarar que es mejor el parche que te agrega una pestaña, ya que podes visualizar y editar el FS del celular desde el teléfono. Acá tengo solo el parche que sólo agrega la 4º pestaña.

Parche VKP;W810 SW-R4EA031
;Extended File Manager.
;Added 4th tab "Internal FS" in File Manager.
;Added 5th tab "Elfs" in File Manager.
;Added support for copying files to TPA and IFS.
;When copying/moving, not only folders are shown, files are shown too.
;Added support for renaming files with .JAR and .JAD extension.
;v. 3
;(c) IronMaster
;(e) stuCk

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Aunque diga que agrega una quinta pestaña, no lo hace, no por lo menos en mi caso.

Saludos