Some hdmi 2.1 features can be added to current devices via software
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Some features of HDMI 2.1 can be added to existing products with firmware updates, something that has been confirmed at a recent FlatpanelsHD meeting with HDMI Forum.
Current devices will support HDMI 2.1 features
This is not surprising since adding features from new versions to previous versions is not uncommon with HDMI, an example of this is that HDR compatibility reaches the original PS4 even though it uses HDMI 1.4 instead HDMI 2.0 which is the standard that officially supports this technology.
Final specifications of HDMI 2.1, 10K resolution and dynamic HDR
HDMI Forum CEO Rob Tobias and his team confirmed that features such as QMS (Quick Media Switching), eARC (Enhanced Audio Return Channel) and VRR (Variable Refresh Rate) can be added to current products through a firmware update, of course everything It depends on the manufacturers of the devices since this update corresponds to them. This means that some of these features could reach TVs and other products before HDMI 2.1 devices hit the market.
Some reports at CES already pointed out that Samsung planned to ship its 2018 QLED TVs with VRR support, offering the possibility for consoles to offer a FreeSync experience, AMD has also stated that they plan to support HDMI VRR with future Radeon controllers.
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