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