SD cards are write protected

I am trying to format an SD card, but it is saying that it's write protected. I attempted to do this with multiple SD cards, and I had the same problem. I looked all over the internet on how to delete write protection. I tried the switch on the card, checking properties, commands, regedit, and computer management. Nothing is working. My computer is also recognizing and not recognizing the sd card off and on the whole time its plugged in.