I know there are diffferent HDMI protocols from 1.1 to 1.3 a or whatever, but does it exist in HDMI cables, or it's BS? A salesman said I have to change my HDMI cable to new 1.3a to get5 advantage of new product ??? Thanks.
The way it works is that a Cable assembly Manufacturer submits a cable to HDMI.org (or one of its testing centres) for a Compliance test - they can choose what level of Compliance (read Cost) they want to achieve.
A Cable that is badged as v1.2a compliant may happily pass the v1.3 Test - its just that its never been submitted to it.