https://qooah.com/2012/01/19/htc-%e5%86%8d%e5%90%91%e6%97%97%e4%b8%8b-6-%e6%ac%be%e6%89%8b%e6%a9%9f%e6%8f%90%e4%be%9b-bootloader-%e8%a7%a3%e9%8e%96%e6%9c%8d%e5%8b%99/