As is known by now, eARC only works with the 1392.0 firmware if you have installed the 1387.1.
Link to Germen Thread
But if for some reason you switch off the Anynet+ (HDMI-CEC) function in the 1392.0 (which also happens with a factory reset, or if you update from a previous firmware), then after switching on the Anynet+ (HDMI-CEC) function again, you will only be offered ARC.
In the German forum there are at least four users with the same error.
Who here also has this error?
Please post it here.