I am Pete, and I'll be happy to assist with your question today.
This appears to be a slight software glitch on the DMR.
You can try performing a reset using the menu first.
If that doesn't work, try installing the latest firmware update, available from the Panasonic website:
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To cancel the lock, try pressing and hold [OK] and [RETURN ] simultaneously until the Hold disappears.
Let me know if that works?
Try pressing and hold [OK] and [RETURN ] - let me know what happens?
If this method doesn't work, try leaving it powered off and unplugged overnight for 12 hours.
Kindly rate my service 5 stars at the top of your question page so I am rewarded for my time; tips appreciated :)
Ok, it is still stuck in Child Lock/Hold mode, so try the following to unlock it:
When the display shows HOLD, press the "Enter" and "1" buttons on the remote together for 3 seconds while pointing the remote at the machine. When the display changes to "DVD1" press enter again. If that doesn't work, try pressing the "Enter" and "3" buttons...
You can use the OK button instead of Enter.