Asus n56u issue

Dear all c hing
After I upgrade the latest russia firmware (RT-N56U_3.4.3.9-091_base.trx) , i cannot remote access to router again with the following error message.

Bad Request

Your browser sent a request that this server could not understand.
Reason: You're speaking plain HTTP to an SSL-enabled server port.
Instead use the HTTPS scheme to access this URL, please.
Apache Server at Port 8081

could somebody could help?:dizzy: