8130, 8330, 8830

Go to Options, Advanced Options, Service Book
Hold alt key (up arrow on 8130) and type S B E B
Should say "Legacy Restore Mode"

9530, 9550

Go to Options, Advanced Options, Service Book
Tilt to Landscape mode
Options, show keyboard, hold the alt button down til it's locked in place type 4 ? 2 ?
Should say "Legacy Restore Mode"