@Jayach
Maybe the older firmware has the channel selector hidden and the developers forgot to set the "hide" class when the media query triggers the css modifications. If that's the case, with such older firmware, try to resize the desktop browser to the size of the android browser. If nothing happens, press F5 once resized. Try also CTRL+F5.
Could also be a matter of User Agent.
With the newer firmware I've tried all the size from 200px to 1920+. No result. I've also tried 20 different User Agent. No useful result.
However in the new firmware there isn't any channel selection field, not even hidden, so there is no chance to see it coming up from nowhere unless server side the router uses the UA to alter the HTML (very low probability because I can see some UA management client side.... by the way I can see they manage some UA except Firefox and maybe it's the reason it's the only browser with problems in the wifi general tab not allowed to save the settings https://forum.vodafone.co.uk/t5/Other-broadband-queries/Vodafone-Wi-Fi-Hub-bug-in-web-GUI-cannot-cha... ).
In the newer firmware I can only see hidden:
- the "Periodic autoscan" (off or selection of minutes)
- the "Auto mode" with values "All channels" or "Compatibility".
Both are not working. I've tried to force them in any way possibile, via css, via JS, resending changing values in the http post header. The values are received, the nginx return the json success reply, but the router ignore them and goes on on channel 64.
I've also removed the list of channels over 48, even from the list of high channels (so the compatibility and "all channels" were identical), and sent it back to the router server: no difference, still on channel 64.
So, I think they have disabled the function completely, server side. To override the server side code the only way is to obtain the firmware source code, modify it, compile, upload it back to the router. Too much work for a thing that should be there in the first instance!
The ridiculous thing is that in this firmware you can read this message in the id="auto-compChannel-info"
The Compatibility Mode will find the best channel from 36, 40, 44, and 48.<br>
It is possible to use All Channels Mode or manually configure one of the other available channels using the Channel dropdown.<br>
Note: Not all client devices support channels above 48.<br>
If you're unsure of what these options do, we recommend you maintain the default settings.
Such message is 100% gold, but what they call "default settings" is what they have just removed and I'm just facing the problems such message was talking about! 😣
