I have a Roku ultra with headphone jack on the side. Up until recently I could hook up the headphones then press the audio (volume button) up x 2, down x 2, up x 3, down x 3 and be able to use the headphones and TV speakers simultaneously. This no longer works. Was there a software update? New trick?
We really miss this as my wife's hearing is not the best and it helps for her to use the headphones when we watch TV together.
Those "secret menu" items are not officially supported and there's no guarantee they'll always be recognized. I haven't a clue why they dropped that one, but perhaps it conflicted or gave problems with some feature that was added later.
Roku Streaming Stick +, 3810X, Ser YH0059427035, wifi - Samsung UN55ES6100
Roku Streaming Stick, 3600X, Ser 5S56D8240827, wifi - JVC EM37T