https://github.com/rssnsj/openwrt-hc5761
https://github.com/hynnet/hiwifi-openwrt-HC5661-HC5761
https://github.com/qdk0901/openwrt-mt7620
http://www.miui.com/thread-1893669-1-1.html
http://bbs.xiaomi.cn/thread-10159544-1-1.html
http://item.jd.com/1184730.html