Our home was built in 2008. An HDMI cable runs behind the wall and comes into the rock fireplace to allow connection of a TV mounted over the fireplace to the Cable box. We recently purchased a 4K TV and 4K TiVo, however, the HDMI behind the wall connecting the two is not a high speed HDMI. There is no way to replace the HDMI in the wall due to the fireplace. Would placing an HDMI upscaler on the TV end correct the HDMI cable speed issue thus allowing me to maintain the clean look without visible cables?