If you cannot access you memory card because
you've forgotten the password, don't panic, there
are a few easy steps through which you can
unlock the card, without beating yourself up about
it.
1. Get a file explorer like FExplorer.
2. Insert card into your phone but don’t access it
through phone.
3. Run FExplorer and Open the path C:\system.
4. You will find a file called mmcstore; rename the
file mmcstore.txt
5. Copy that file (mmcstore.txt) to your pc and
open that file in notepad. You will find your
password in that file.