To change your HDMI resolution, follow these steps:
Open the Main Menu
From Box Management select Picture & Sound
Select HDMI display setting
Choose your preferred setting. If you are using an Ultra HD box, make sure your box is set up correctly first.
We'll ask you if you want to keep this setting, select Keep
If your TV goes blank after changing the setting, please wait 15 seconds
Please note: All YouView boxes support 720p, 1080i and 1080p resolutions (i=interlaced / p=progressive).
If your TV does not support higher HD resolution such as 1080P or UHD you can reduce the resolution to 720p (most HDTVs should support this).
If you want to switch to 720p quickly, we have a secret button combination:
Press 7 > 2 > 0