if your version is 2.1.3
pls connect he console cable
console password is last 8 digits MAC of WAN port,example 2E05AABB
root/2E05AABB
upgrade 2.1.4 ,2.1.5,2.1.7
cd /tmp
/etc/scripts/mymd5.sh uImage-md5.u50v2.v214
/etc/scripts/mymd5.sh uImage-md5.u50v2.v215
/etc/scripts/mymd5.sh uImage-md5.u50v2.v217
after get the true,then reboot and reconfig again .