How to switch the Input on Android Projector?...when there is no Input Menu in Settings

I have a micro projector that runs on Android 4.0.4.
It plays videos from the USB port via the default MX Player Pro, and works well.

However, it does not automatically recognize the HDMI input when connected (or the VGA). Similar versions online have an Input selection in the settings, but I certainly can't find it.

Is there another way to switch the input to/from HDMI?
(is there an app that will let me switch inputs?)

thanks

PS
it says Model 320A powered by DLP LED (Texas Instruments)...but may be a knock off, as it was bought in Hong Kong, and I can't find any reference to that model online.

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