Edit the “/tmp/system.cfg”
Change the line that contains “dhcpc.status=disabled” to
add the following lines
dhcpc.1.devname=br0 dhcpc.1.fallback=192.168.1.20 dhcpc.1.fallback_netmask=255.255.255.0 dhcpc.1.status=enabled
Save and exit and save changes
Log into the GUI and verify everything looks correct. Under the network tab it was still showing that it had a static address, although it pulled a DHCP IP.