luna://com.webos.settingsservice/setSystemSettings is now `404 no such service or method` on LG C2(2022)

[digglife]

For enabling full service menu, we need to set svcMenuFlag to true. But now it seems we can't do that. I tried with raw wss message, it returns "error": "404 no such service or method", which seems that they've hidden the endpoint.

Is there any workaround?

My System:

Device - OLED48C2PJA
Firmware version: 33.22.80
webOS version: 10.2.2

ColorControl/ColorControl/Services/LG/LgDevice.cs

Lines 1179 to 1184 in 1c22b2d

	public async Task SetSvcMenuFlag(bool enabled)
	{
	await CheckConnectionAsync();
	await _lgTvApi.SetSystemSettings("svcMenuFlag", enabled, "other");
	}

ColorControl/ColorControl/lgtv/LgTvApi.cs

Lines 432 to 445 in 1c22b2d

	public async Task SetSystemSettings(string key, object value, string category = "picture")
	{
	var jsonValue = ParamToJson(value, ref key);
	var lunauri = "luna://com.webos.settingsservice/setSystemSettings";
	var extra = key == "truMotionMode" ? @", ""current_app"": true " : "";
	var json = @"{ ""category"": """ + category + @""", ""settings"": { """ + key + @""": " + jsonValue + @" }" + extra + " }";
	var @params = JObject.Parse(json);
	await ExecuteRequest(lunauri, @params);
	}