WD smartware thinks my password is wrong..!

I have a “Western Digital My Passport SE” whose data are password protected.

I signed. The unit is accidentally unplugged, so when it is reconnected, I was prompted for a password. I entered, but all I get is the window that says “the password is incorrect”… I entered the correct password (I’m sure, for several reasons (use the same, before detaching it worked…))

Now I no longer have access to data … Is there a solution to access data without losing them?

I used a Mac OS 10.6.8

Thank you, Fabio