Hi guys I just open a S9 for maintenance, I just brus the dust from the cards with a soft paint brush and put it back togheater. I do this once Every two months or so. So far with no problems, this time one S9 displayed this massege Socket connect failed: Connection refused. An two of the hashing boards wont work.

I've tryed intalling every posible firmware available even old ones I found in this forum and nothing. Can any budy help me?

Thaks