Connect your device to an HDMI display
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Using an HDMI cable, connect your BlackBerry device to an HDMI display.
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Your device automatically detects the resolution of the HDMI display that
your device is connected to. However, if you need to change the resolution, on
the home screen, swipe down from the top of the screen. Tap
Settings >
Display. In the HDMI Display Mode drop-down list, tap the
display mode that you want to use.