There is no HDMI out ?

If your Device's USB-C Port does offer Display Output mode, and there no signal on HDMI out of hyperdrive, please help to check:  

-The length of the HDMI cable can not exceed 2 meters.

-Some manufacturers make its cable so that one end has to be connected to a display monitor, and the other end is connected to the source.  Normally, the end to display monitor has a "TV" marked on it.

-HDMI has to connect to an HDMI display monitor with HDMI to HDMI cable.  It is not compatible with the DVI/ Display port or other non-HDMI monitors, even with an adapter. You will need an Active Converter that can correctly convert the signal. 

-Make sure your Display is set to correct HDMI input source. 

-Test the HDMI Cable and Monitor/TV/Display to ensure they are also functioning properly. 

-Turn off / Reset your USB-C Device, unplug then reconnect the Hyperdrive. Also switch off then unplug the Monitor/TV/Display and try to reset the connections to try again.