Thank you for your query.
Can you ping your end device(from the router) from br-lan interface? In other words, lets say your pc has LAN ip address of 192.168.1.1, can you ping from the routers CLI in the following manner? ping 192.168.1.1 - I br-lan? Also can you ping the router from the PC?
Also could be please elaborate a little bit regarding your setup and provide the topology, ip addresses in use as it is really hard to say now without any information provided.