https://www.ghacks.net/2017/05/02/fixing-bootmgr-is-missing-error-in-windows/
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https://www.ghacks.net/2017/05/02/fixing-bootmgr-is-missing-error-in-windows/
origin - http://www.pipiscrew.com/2017/05/fixing-bootmgr-is-missing-error-in-windows/ fixing-bootmgr-is-missing-error-in-windows