This means that the switch inside the camera that senses the SD card protection switch is bad or broken. Take the card out of the slot and look inside with a small light and check the side where the corresponding location for the switch is. See if there is a part missing or stuck. In most cases this is something you cannot repair yourself. You have to send the camera in
Of course, you just need a piece of data recovery software.
Try Cisdem Data Recovery:
Step 1. Take out your sd card, then connect to your mac with a sd card reader;
Step 2. Launch Cisdem Data Recovery, choose External Drive Recovery
Step 3. Choose your sd card and click "Scan"
Step 4. Preview files and select
Step 5. Click "Recover" to get files back
Best Way to Do SD Card Recovery on Mac 2018 Editionhttps://www.cisdem.com/data-recovery-mac.html