Originally Posted by 96DANGER96
Use ES file explorer, tap the world icon on the top left, Tools, Root Explorer OFF To on, give root permissions, after tap on root explorer again (On the Word now, not on the "ON" button and tap Mount System R/W On the menu that will appear.
Sorry for my english
From the screenshots he has posted, the folder is already in R/W mode
All the files in that folder have readonly atttibutes set r--r--r--. Try copying the files to some folder in the sdcard, change them, then move them back to the folder and set the same permissions as before.
Galaxy S4 Mini I9192 - Stock / Rooted
Xperia Mini Pro -
Real Xperia Mix r1.7 / Kappa 1.7 Beta Carbon 4.4.2 KitKat / LX Kernel
Xperia X10 Mini Pro - MiniCM7-2.2.1 (GingerBread 2.3.7 / CM7.2) / nAa-14 Kernel