I gave a password into my memory card.but when the

i gave a password into my memory card for security.but when the phone is in service centre,I forget to remove that password.the person of service center has installed new software or update the mobile software again.Iwhen the phone is ok & i inserted the memory card.it aks for password.i give my old password but it wont matched.everytime it says password incorrect.plz help me without any hassle.its very important for me.