Promethean generally manages firmware through two primary methods rather than public "direct download" links for end-users to manually flash via USB (unless required for recovery):
Updating firmware is a critical maintenance task. Following best practices ensures a safe and successful outcome. lddh350aa75 firmware link
: Fixes known bugs, unexpected crashes, and system freezes. lddh350aa75 firmware link
: If the part is a controller (e.g., for a 3D printer or CNC machine), the "AA75" suffix may refer to a specific revision. You should contact the manufacturer’s technical support or check the Product Download Center if applicable. Check the Controller Board lddh350aa75 firmware link