All warnings from Part 1 still apply.
Press and hold [2nd] and [del].
Turn the calculator over; press and release the 'reset' button.
Keep holding down [2nd] and [del]!
If you did it correctly, you will see a 'Install OS now' screen. If you do not see this screen, try again.
Once you see this screen, you can release [2nd] and [del].
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