You can send any 4k video signal into the HDMI inputs of your AVR, and it will be sent to your TV screen from the HDMI output, either in 4k or 1080p. Sometimes it may be necessary to switch off the TV set, then switch it on again, to activate a new "handshake" between the devices, in order to open for the 4k signal, if normal HD 1080p signal was the last signal used. Please note that not all 4k signals can be viewed. Many streamed videos from Youtube will work, as will any 4k material that you have recorded yourself, and many TV boxes will work also. However, HDCP 2.2 protected material will not be shown in 4k, but will be converted to full HD 1080p signals, because these AVRs do not support HDCP 2.2 digital copy protection. HDR is not supported.