You will usually find a .hd or .fls file and a small executable (often named usbprns2.exe ).
This is often used to allow the printer to operate with cartridges that do not have a chip or have an expired chip. Compatibility: Ensure the "Fix" firmware matches your Serial Number and current OS Version Procedure: Drag the firmware file (usually a file) onto the usbprns2.exe application provided with the fix. Firmware Samsung ML 2850 --