now tell me the exact solution i have to take my homework to my uni
Please don't make demands. We're all volunteers here and provide help for free.
Unfortunately, as mroilfield pointed out, we generally don't help with password retrieval. You just gonna have to ask his cousin to think really hard or contact the drive manufacturer. They'll probably require a proof of purchase for help, if they'll even help at all. Other than that, like mroilfield said, you might be better off buying a new drive.