I have UE49MU6670U model and i tried enable the developer mode using 12345 option. Apparently it worked however when i am trying to enter the ip address when i restart the tv and check if the IP address is persistent it shows empty IP address.
Did a reset of the TV . still same issue.
Is there something i am missing in the regular steps. I did try with other tv which is 2018 and it worked
Any Indicators will be very helpful