I used to have a Gridseed G-Black, which was essentially just a bunch of Blades sharing a common controller. I had one blade card that refused to hash and what I found was that the connector must have come unseated during shipping. Try removing the connectors to the blade and then plugging them back in again to make sure they're seated properly.
i do exactly what you told me, but stil can not work. i guess i use just 1 blade. unfortunately, i don't use raspberry, i just plugged into my PC.