So I figured out how to change the boot animation on the Optus G3
data/.OP/OPT_AU/poweron or poweroff
Replace those bootanimation zips
However! I cannot find the audio files for the boot animation. So it still plays the optus sound -.-
If anyone knows where to find those audio files please let me know
I found where the sound is stored.
system/media/audio/ui/PowerOn.ogg or PowerOff.ogg
Hope this helps someone