How can I change the HDMI resolution on my device. To change your HDMI resolution for on your Netgem TV device. Go to settings > sound and picture > select HDMI resolution and select the resolution which best suits your TV. Related articles Can I change the Audio Output Mode? How can I change my Video format? How can I use the Alexa voice commands with my device? Why can't I hear any sound from my SoundBox? Comments 0 comments Article is closed for comments.