Bit of research told me that your current cable is a “Type 1” adaptor, up to 165MHz, newer “Type 2” capable of running 300MHz TMDS. I can only speculate but it seems the Type 1 support was cancelled in the Ampere gen so it doesn’t work. Unfortunately, looking around at shops it’s never said which “Type” the cables are. So I guess you can only order a new one and try.
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