https://blog.faceutil.com/2017/04/19/%ea%b0%84%eb%8b%a8%ed%9e%88-%ec%84%a4%ec%b9%98%ed%95%98%eb%8a%94-%eb%b0%98%ec%9d%91%ed%98%95-%ec%8a%a4%ed%82%a8-fastboot-v1-6-2-%e3%8f%81/