Procedure for "entering maskrom mode", from the link above, is so cool! Reads like some magic ritual:
> Flip the device around so that the display faces down
> Lay the pen on the right side, with its tip pointing towards the speaker grill, and its magnet pointing towards the upper right corner of the label on the back.
> Flip the device around so that the display faces down
> Lay the pen on the right side, with its tip pointing towards the speaker grill, and its magnet pointing towards the upper right corner of the label on the back.
> Turn the device on (...)