Sharp XG-C58X Service Manual page 19

How to Release the System Lock
Turn on the power. If the system lock is applied, the system-resetting screen appears. Press the following keys in this
order.
MENU → ENTER → ENTER → MENU → UNDO → UNDO → MENU
After pressing the MENU key first, press the remaining six keys within 10 seconds.
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XG-C58X
XG-C68X