I’m just quoting the HDMI forum on the matter that the manufacturer may opt to release firmware enabling certain features from the HDMI 2.1 set onto 2.0 devices. In this example they were referring to panels.

This is certainly interesting and help the product to stay more current. If you remember 3D wad released as a FW feature by Meridian for HD621 in a similar way.

DSP8000SE, DSP7200SEHC, DSP5200SE sides, DSP7200SE rears, 861v8, 210, Sim2 Ultranero 4, Stewart Cinecurve 2.35:1, XEIT CM-5E Anamorphic lens, Dune HD Duo Cinema 8K and Wireworld Platinum 48G HDMI -> UHD722 -> Shunyata Omega Ethernet. Shunyata/Furutech power-cables/filters. SR Master Fuse@861v8. Uptone Etherregen with 10MHz OCXO clock.