The most common reason is a broken or wrong registry entry for the USB port. This can happen if you keep plugging and unplugging the printer or if the driver wasn’t installed correctly. Other possible reasons include old computer drivers, USB controllers that are causing conflicts, or power settings that are stopping the computer from finding the devic Here’s a simple step-by-step guide to update a Brother printer’s firmware when your computer sees it as a USB Composite Device instead of a printer: Note: If you don’t have access to another computer that recognizes your Brother printer correctly, some users have had luck fixing this by connecting their Brother printer to the same computer through the Network port (instead of USB) and then following the steps above.
