Default Camera shutter sound

Hi guys.
I flashed the custom rote X-Note 15 and suprisingly I still can't disable the camera shutter sound.

I tried many ways :

- app Galaxy Note 2 hidden features
- app silence stream something
- app camera mute

I also tried to remove the ogg files from /system/media/audio/ui/ , camera_click.ogg and camera_click_short.ogg, renamed them to .bak.
Camera still makes sound ...

I replace the orignal ogg files by copies of camera_empty.ogg ... in vain. Still the ****in sound.

I don't get where the sound comes from. I though maybe it was in RAM , so I restarted the phone, still the sound was there.

Now I found the apk SamsungCamera2Guy.apk, which contains the sound. But coudl it be possible that the application takes the sound file from the apk each time ?

If so, I would like to edit the apk and remove the file directly. I tried with a few tools but it failed so far.

Any hint how to remove once and for all the sound ?