This guide will show you how to easily mute the startup and shutdown sounds on a rooted Sprint or Ting Samsung Galaxy S2 or S3.
Update: if you do not wish to root your device or want to mute other sounds, learn how to silence any sounds on any device with Tasker.
This is a very easy fix if you have already rooted your phone. If you have not yet rooted, I would highly recommend it as you can root the stock roms very easily. I am not going to cover rooting in this post as it is extensively covered by many other people – just google “how to root [your phone] [your software version]” and you will find all the information you need. See the beginning of this post for brief instructions how to root the latest (and final) release for the Sprint Galaxy S2.
So, now that your phone is already rooted, this is the by far the best method to mute the boot up and power down sounds. The screenshots shown below were taken with a Galaxy S2, but should be nearly identical with the Galaxy S3 (let me know if they are different).
First, if you do not already have some sort of root file browser, download one – I am using root browser lite in this tutorial – but anything that can change file permission will work fine.
Now open root browser and navigate to system → media → audio → ui as shown below:
Now find PowerOff.wav and PowerOn.ogg as shown below:
Long press on PowerOff.wav and then select “Permissions.” Once you have selected permissions, UN-check all of the permissions as shown below and press OK. The first time you do this your phone will ask if its okay for the app to have root privileges – grant them, and it won’t bother you any more.
Repeat this process for PowerOn.ogg, again turning off all of the permissions. Once you have turned off all the permissions the PowerOff and PowerOn files should look like this with no read or write permissions:
That is it! No more annoying boot and shutdown sounds on the rooted stock ROM.