Have you enabled Dolby Digital Plus in the TVs sound settings? It is essential to have this on to pass Atmos via ARC or eARC to a soundbar or processor.

Yes, Release notes would be great... UK6470PLC..

What does webOs update 05.20.03 do for my LG 65uk6300 tv

Hi I have LG and installed Smarters can’t say it works great TBH.

In Italy mod.49UK6400PFL Today I received firmware 05.20.03 I don't know the changelog or see any visible difference yet.

I store my media on a PC using the DLNA built into Windows to serve the files.  I've never seen this. Unplug the TV power cord from the wall for at least 5 minutes and retry If it'still not updated, I suspect your NAS is the problem.

The reset will only reset using the current firmware, not the original or earlier. Try unplugging the power cable from the wall for at least 5 minutes and then check the TV  

@George Hofmeister thanks a lot for all the information.