How can I remove a self write protected CD card?
Answers:
Probably either the chip inside the card developed a short or the external part of the switch has become dislodged from the part inside that makes the electrical connection. If it's a short in the chip there's nothing you can do about it but if the switch fell apart then you may be able to stick something in the switch slot and move the internal piece so it's not locked anymore, but if you do that you risk damaging the chip so I don't recommend doing it.
So basically the SD card is busted and you should probably get a new one.
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