Abra a planilha e aperte ALT + F11
Click no botão Play (Verdinho)
De um nome para a Macro e clique em CRIAR
Cole a seguinte macro.
Sub DesprotegerPlanilhaAtiva()
Dim i, i1, i2, i3, i4, i5, i6 As Integer, j As Integer, k As Integer, l As Integer , m As Integer, n As Integer
On Error Resume Next
For i = 65 To 66
For j = 65 To 66
For k = 65 To 66
For l = 65 To 66
For m = 65 To 66
For i1 = 65 To 66
For i2 = 65 To 66
For i3 = 65 To 66
For i4 = 65 To 66
For i5 = 65 To 66
For i6 = 65 To 66
For n = 32 To 126
ActiveSheet.Unprotect Chr(i) & Chr(j) & Chr(k) & Chr(l) & Chr(m) & Chr (i1) & Chr(i2) & Chr(i3) & Chr(i4) & Chr(i5) & Chr(i6) & Chr(n)
If ActiveSheet.ProtectContents = False Then
MsgBox "Planilha desprotegida com sucesso!!!"
Exit Sub
End If
Next
Next
Next
Next
Next
Next
Next
Next
Next
Next
Next
Next
End Sub