How or can I change default sounds on BB 10 (Z10)

Hi!

I'm not talking about profile/notifications/callander etc sounds settings.

I'm talking about the phone itself default sounds. Can I change those?

-When the Z10 turns on...it makes a sound
-When the phone turns off... it makes another sound.

I want to change the sound for when my phone turns off (or when the battery is depleted and turns off) sound.

I've been reading tons of forums about sounds and none is about the default phone sound.

If it is do-able please someone let me know.