Camera says card is locked but it's not!!!
You already know about the 'lock' switch on SD cards; did you know it doesnt actually lock the SD card by itself? It merely pushes a switch lever in the reader (in this case, your camera), that in turn tells the electronics to NOT write on the SD card.
So, if your SD cards are indeed working (check on a card reader), it would look like the lever in the camera that senses the position of the lock switch is jammed / bent. If you could pry into the card slot in the camera, and try to shake this lever with a long narrow object (a straightened paper clip, perhaps), that might yield good results.
Alternately, look up 'CHDK' on Google; it is an alternate OS that gives your Canon *lots* of other features. In your case, more importantly, it *requires* the SD card to be locked in use. Dont worry, with CHDK booted in, the camera will store pictures even when it sesnses the card is write-protected. So, it not only solves your problem, it gives you loads of extra features like RAW capability, time laps, remote operation and more, all for free.
Regards,
Anand Dhuru
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