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Ice while the wake of perusing these means each Macintosh client can resolve the issue that they fae eradicating or reset everything on macintosh .stage 1: Take your back up Step 2: Delete your everything private documents in your MacBook, Step 3: Turn off FileVault choice on your macintosh, Step 4: Remove your record on icloud or you need to sign out on your icloud account the two things are same, Step 5: Now, you have erased your everything information now you are prepared to reinstall you need to go to macOS Utilities menu. From that point reinstall on macintosh os.