https://unixwise.xyz/wordpress/2016/10/unpack-%e6%96%b0%e7%8e%a9%e5%85%b7-lg-%e6%9c%80%e6%96%b0%e6%97%a2%e4%b8%ad%e7%b4%9a%e6%a9%9f-x-power/