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STEVAL-C34KAT1 Vibrometer eval board came today and I see it came with 32 pin expansion flex cable (STEVAlL-FLTCB01).   On one end, I plug it to this eval board.  On the other, what do I plug it to?  None of my ST eval boards have such connection.   ...
I follow the prompts and no upgrade firmware file is downloaded to my phone.  Please see pictures: