https://blog.wongcw.com/2019/09/23/%e8%8f%af%e7%82%ba%e6%be%84%e6%b8%85%ef%bc%9a%e6%9a%ab%e7%84%a1%e8%a8%88%e5%8a%83%e8%a7%a3%e9%99%a4mate-30%e7%b3%bb%e5%88%97%e7%9a%84bootloader%e9%99%90%e5%88%b6/