Install OpenWRT on ASUS RT-N13U B1 and configure Hilink 4G modem

1 – Dowload firmware and upload over tftp

http://wiki.openwrt.org/toh/asus/rt-n13u

http://luizluca.blogspot.com.br/2012/01/openwrt-turbine-seu-roteador-instalando.html

2 – install luci

http://wiki.openwrt.org/doc/howto/luci.essentials

3 – Install kernel drivers for usb thetering

https://www.google.com.br/search?client=ubuntu&channel=fs&q=cdc_ether+param&ie=utf-8&oe=utf-8&gfe_rd=cr&ei=nuKAVZOYAdCJhASt04CwBQ#channel=fs&q=cdc+ether+openwrt

https://downloads.openwrt.org/snapshots/trunk/ramips/rt305x/

https://downloads.openwrt.org/snapshots/trunk/ramips/rt305x/packages/base/

http://wiki.openwrt.org/doc/howto/usb.tethering