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Once your images are safe and sound, you can try the following methods to fix the unreadable SD card.
Method 1. Check and repair the file system error.
The file system of your SD card might be corrupted and causing your SD card to be unreadable. To check and fix the corrupted file system, you can run CHKDSK command on your Windows PC.
Step 1. Use an SD card reader to connect the SD card to the PC.
Step 2: To open the Command Prompt panel, right-click the Windows icon, type cmd in the search box, then press Enter. If necessary, enter your administrator account and password
Step 3: Enter the following command:
chkdsk /f sd card letter:
chkdsk sd card letter: /f
The SD card letter refers to the letter of the volume you want to check and repair.
Wait for the checking and repairing process to be done. If unfortunately, this method fails to fix your corrupted SD card, you can move to the following one.
Method 2. Format your SD card into FAT32.
Step 1. Connect the SD card to your PC.
Step 2. Right-click on This PC/My Computer and Choose Manage.
Step 3: Locate the SD card, right-click it, and then select Format from Disk Management.
Step 4: Choose FAT32 as the SD card's file system, then click OK to confirm.
Now your SD card should be good to go. Simply copy-paste your files into it and you can use it as usual.