Notice: The warranty time period for control boards with logo is 150 days (calculated from the day of shipment), and people with out symbol are usually not coated from the warranty. A:Hello, thank you for the message. Please get in contact with our sales supervisor by using WhatsApp at +8618623251355. https://antminer-controll-boards15566.bligblogging.com/38221280/everything-about-antminer-controll-boards