According to the spec sheet, HDMI 2.1 / HDCP 2.3 is supposed to be already supported in RX-A8A/A6A/A4A without any updates:
Specs for the Yamaha RX-A6A AV receiver – a reference standard in home theater with 9.2 channels and 8K HDMI, Dolby Atmos and Vision, DTS:X, and more.
usa.yamaha.com
So is it not supported, or perhaps on outputs only? Or, is
@Replicant 7 writing about some other "2.1" (not HDMI)?
Just placed my order for the A6A, so...