Unable to rename system file
I've had a good search around but I cannot find a solution to my particular problem.
I want to rename the file camera_click.ogg in system/media/audio/ui to disable the shutter sound when taking a picture.
My phone is rooted (using UnrEVOked 3.21) and S-OFF (using alpharev 1.8) so I assumed this would be easy.
I am running CyanogenMod 7.0.3 and trying to use the terminal emulator that was installed with this ROM.
I ran the emulator and typed the following, as I understand it this would mount the system area as read/write
mount -o rw, remount /dev/block/mtdblock3 /system
When I hit enter I got this response
Mount: permission denied (are you root?)
Can anyone help me with this as I am obviously missing something?
Phone info is
BRAVO PVT1 SHIP S-OFF