Then I have virtually no use for that connection.Long press blue button and you will see the HDMI-In option.
But imo it's pointless using it, It will accept a 1080p device, but only records at 720p30, so unless you are using an old hdmi device from the USA or similar, then the recording will not play smoothly.
I think it's completely useless....Then I have virtually no use for that connection.