How do you get the update notification to go away?
The Update should download under Cache or Data/Cache. It should work disabling OTA updates in the hidden menu.
3845#*959#, the go to WLAN test --> OTA Settings and disable...
I was only able to get a toggle for Pure Surround with
*Attached my com.lge.videoplayer.xml file
Probably the easiest way to hide the app drawer icon is to press and hold the icon, select change icon, then custom icon, and select a transparent image.
I tried your file and had the same result, so i took your original wave and converted it. This one hasn't given me any issues.