Interrupting a firmware update can brick your projector. Only do this if Acer support explicitly instructs you.
Since the projector doesn't have its own driver, it relies on your computer's graphics card. If you aren't getting an image: acer x113 projector drivers
: Press the Source button on the projector or remote to ensure it is set to "VGA" or "D-Sub". Interrupting a firmware update can brick your projector