Hi Simon,
My smart TV is not so smart. The crazy Russians have not been able to figure out a way for the newest firmware to get into. There is absolutely no way to enable the debug mode. My TV is an LG 49LF6300 (Canadian model). I enabled the serial port and am able to send commands to it. But this downgrade procedure does not work. I can see that the DNS server is responding. The dump file is empty though. I tried on Win 10 and Win 7 with the same results. Tried few versions of the LG update package.
Any ideas?
Thanks,
-Tom