Well, starting from Sierra, macOS comes with an extra security feature, which doesn't allow any data recovery application to operate. So, after talking with the data recovery company, I was told to execute certain commands from a single user mode, then only the app would be ready. Since, I knew what is this single user mode, I was saved. Actually, this book only discusses macOS shortcut keys. I think such series needs to be next to all mac user.
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