Actually, it is a hardware upgrade for Trinnov as well to go to HDMI 2.1. The cost is 1000 to 1250 Euros depending upon which HDMI board is currently in the Trinnov. The HDMI handshaking and HDCP compatibility are handled on the HDMI board. Some boards have different power requirements, and this is where the bolt on upgrade can get complicated.

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#1 Trinnov Altitude 32-8-16, 271, 8000XE, 7200SEHC, 7200.2, Seaton F18, JL Fathom F113, Revel w990's, Kef R7, ATI 528 Amp, JVC RS4100K, SI screen. Roon Nucleus+, Eno AG, Eno M link, 218.
#2 Mark Levinson No5105, Ayre VX8 and CX8, Vandersteen Treo CT, Preamp varies.
#3 Meridian Ellipse