nemilose

With my TV it is possible to change the input source using one button. I press it several times until the desired source is selected. Then I wait for a couple of seconds and the source is selected without pressing the OK button.

It is not possible.

I do not believe that it is possible. Video output is not built in probably due to the DRM.

With my TV, I press List button on the remote, then click on Filters, and finally I choose a Favorite group. All in all, far from user friendly.
I exported the list of channels to USB flash, arranged them in ChanSort, and imported to TV.

I am Europe, Serbia. We should be a highly restricted country :-)
According to the specs, we have the same WebOS version. I do not know why you don't have HBO-Go and I have. What is even stranger, LG is not on the list of the supported TVs:
https://help.hbogo.com/hc/en-us/articles/204870497-Which-connected-TV-devices-is-HBO-GO-supported-on-

It is strange that some TVs have HBO-Go, and some don't. For example, I have it with WebOS 3.0.

With my 2017 UH8507, I can get the cursor to show up if I shake the remote. It should be a Bluetooth remote.

How do you measure the speed of different TV platforms?
LG is fast enough. I have no complaints.

I do not think that you may use magic remote with PC, but you can use a phone app, such as Unified Remote.

There are YuppTV and YuppFlix apps in LG store. You may install them for free.

2017 TVs have WebOS 3.5, 2016 3.0 and so on.
My 2016 model has WebOS 3.0 and software version 5.30.10

You may check at LG website. If they do not offer a newer version, it is very likely that there is no new version. BTW, I don't believe that the upgrade will help you with the flash videos.

Any new drive should be ok. I have two USB 2.0 and one 3.0 and all of them work correctly.

https://www.lgwebos.com/index.php?/topic/3144-Unable-to-load-user-agreement

Check this
http://www.lg.com/ca_en/support/product-help/CT20098013-20150269322984-others

https://www.lgwebos.com/index.php?/topic/2841-Google-play

I clicked on 4.70.30 link and started download. Then, I copied link and pasted to text editor:

https://www.lg.com/us/lgecs.downloadFile.ldwf?DOC_ID=20150525095161&what=MANUAL&fromSystem=LG.COM&fileId=AU57bTFgijJLAzWedONN8g&ORIGINAL_NAME_b1_a1=Software_File(Version_04.70.30).zip

Finally, I replaced 4.70.30 with 4.70.07, pasted it to browser and started download:

https://www.lg.com/us/lgecs.downloadFile.ldwf?DOC_ID=20150525095161&what=MANUAL&fromSystem=LG.COM&fileId=AU57bTFgijJLAzWedONN8g&ORIGINAL_NAME_b1_a1=Software_File(Version_04.70.07).zip

My WebOS 3.0 TV UH8507 has WiFi On/Off button, as on pictures.

I am in Europe. I purchased 2016 model 49UH8507.

HBO GO was installed on my webos 3 TV out of the box.

You need some DLNA server running at your NAS. For example, Plex, Twonky, Serviio. You may use the WebOS built-in DLNA player, or you may install a third-party app from LG store.

I personally prefer Plex server with XPlay application.

I think that old recordings are encrypted and only your old TV is able to decrypt them. It will not even work on the other TV that is the same model as your old TV.

42 minutes ago, AnonViewer said:

1. Does connecting my STB with the other type of cable (sorry i don't know what those cables are called) help in any way? Also, check this link  - http://www.lg.com/us/support/product-help/CT10000018-1434379208807-adding-deleting-channels

             As per this LG help article, both Antenna and DTH should work similarly in fetching the TV Guide and tuning channels. If I go by that article, connecting through HDMI shouldn't make any difference 

I was not aware of this feature, but it seems that you need to have a compatible STB with supported service provider.

HDMI is certainly the best way to connect STB.

1. You should set resolution within STB menu. Both 720p and 1080p are HD resolutions, with 1080p usually being called Full HD.

2.  Live TV works only with channel you are receiving with coaxial antenna cable plugged directly in TV (terrestrial, cable or satellite channels)

3.  TV Guide is available only for Live TV channels. Use your STB remote for the Guide.

4.  Only Live TV channels may be added to My Channels.

5.  I do not know.

6.  I believe that you cannot. Maybe you can if you pair TV's remote with STB.

7.  That probably works only with some specific STBs.

I think that the only problem with external HDDs may be power related, i.e. TV's USB port may not deliver enough power to HDD. However, this should not be an issue with any modern HDD (2.5", USB 3.0). USB 2.0 should not be a bottleneck. Cable TV channels usually have bitrate  of up to 10 Mb/s. That is 1.25 MB/s, which is supported by any HDD and is way under the capacity of USB 2.0.

Here is the list of drives that my TV (49UH8507) was able to use as a recording device:

1. WD My Passport Ultra 1TB, USB 3.0 plugged into USB 3.0 port on TV

2. Apacer AC233 1TB, USB 3.0 plugged into USB 3.0 port on TV. It also works plugged into 2.0 port.

3. An old Apacer AC203 500GB, USB 2.0 plugged into USB 3.0 port on TV. This HDD was designed to draw power from two USB ports using Y cable. However, it successfully works with a regular mini USB cable.

4. Sandisk Extreme 32GB, USB 3.0 flash disk

5. An old Silicon Power 8GB 3.0 flash disk, plugged into 2.0 port on TV. I successfully recorded some cable TV HD channel .

Virtually anything I tested was working ok.