Question [Q] How to disable virtual cdrom mount?

Stock Android 4.3 VZW One Max, Firewater s-off, rooted SuperSU, TWRP Recovery.

Dial ##7764726
Hit Call
Type Password is 000000
Hit Feature Settings
Choose CD ROM
Click Disable
Hit menu, commit modifications (it will say no item changed)
Back out to home
That's EPST,it is supposed to allow you to disable
mounting of /system/etc/CDROM.ISO as a virtual
cdrom, but it doesn't store the change?

What am I doing wrong?