The power off memory function setting method is on the condition that your remote have a SLEEP button.
Press SLEEP button 10 times in 10 seconds, if you hear 4 "Pi" sound this means the function be set.
If you press SLEEP button 10 times in 10 seconds, and hear 2 "Pi" sound this means the function be canceled.
For some old models, the remote doesn't have SLEEP button, please call for visit service