But it isn’t a simple firmware update

Last year, we reported on a “major HDMI 2.1 bug” that meant Denon, Marantz and Yamaha’s high-end 8K AV receivers couldn’t support 4K video games played at 120Hz. The good news is that Sound United, which owns Denon and Marantz, has announced a fix.  

“The SPK618 adapter takes an HDMI input signal from the gaming source and delivers the corrected HDMI data to the AVR, remedying the error and allowing a 4K/120Hz or 8K signal to pass,” a Sound United spokesmen said.
…
Read more