How to change the charging chime on MBP (PowerChime.app) Many people want to disable the charging chime introduced with the USB-c MBP's (and some enable on non-USB-c). I, however, want to change the chime. 

Sadly however I can't change anything in "PowerChime.app" even after disabling the SIP (startup CMD+R, terminal > csrutil disable). I also can't "swap" the PowerChime.app app.

Does anyone know a solution for this?
I had the same exact question, Googled it, landed on here and found the answer hours later, lol.
If you're still looking for the answer, or for anyone's future reference -- after disabling SIP and restarting, open terminal and run:
sudo mount -uw /
killall Finder

... and you're good to go. Just proceed to replace the .aif file in &quot;Powerchime.app&quot;. For me, I changed mine to the old iOS charging chime!
Haha