We identified two issues Like it was written, a Pin was bend on the bus coupler, this explain red flashing LED ESI device description file provide EoE support, but the current S20-EC-BK till AC1 isn't supporting S20-EC-BK =< AC1 need S20-EC-BK_019.xml or S20-EC-BK_023_eoe_patch.xml (attached) S20-EC-BK >= AD1 works fine with S20-EC-BK_023.xml
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