Then follow those steps:
1. Install the X-plore application in your nokia phone.
3. After completing the above step goto C:/Sys/Data/MmcStore
4. Now press 3 button from your keypad and you will see options. Now click on the Hex-viewer option. This will make your phone to show files in hexadecimal.
5. Look at the 3rd Column On the screen you will see a code like ! TMSD02G (c??”?x???6?2?6?2?6) .Note down the numbers present between the ?This is your memory card password. Like in this example the password is 62626.
6. Now you can enter the password and view your memory card files or you can reset your memory card password to a more memorable password.