Hello Vinod:
How did you notice your device is secure?
The way to unsecure a Kinetis device is with a Mass Erase. However, if your KL04 is secured, CodeWarrior should ask you to erase it (a message box saying "Device is secure. Erase to unsecure?), and clicking on "Yes" usually solves it. Do you see that message?
If this does not work, try with the "Always mass erase on connect option", in the connection settings, as in the attached picture.
Regards!,
Jorge Gonzalez
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