https://blog.wongcw.com/2018/11/25/%e4%bb%bb%e5%a4%a9%e5%a0%82%e7%9a%84switch-bootrom%e7%a1%ac%e4%bb%b6%e7%bc%ba%e9%99%b7%e8%a7%a3%e6%b1%ba%e6%96%b9%e6%a1%88%e5%b7%b2%e8%a2%ab%e6%94%bb%e7%a0%b4/