How to Unlock MMC card

Insert card into your phone but don’t access it through phone.
Run FExplorer and Open the path C:\system.
You will find a file called mmcstore, rename the file mmcstore.txt
Copy that file(mmcstore.txt) to your pc and open that file in notepad.
You will find your password in that file.

Need a file explorer like FExplorer, you can download from here