How do I update the firmware on the Samsung Xpress SL M2020 using a USB port?
Turn the machine off, connect the USB cable, then turn the machine on and confirm it is in ready status. Drag and drop the firmware file onto the usblist2.exe tool, and the firmware update will start automatically. When the upgrade is completed, the machine will automatically reboot.
From the official HP Samsung Xpress SL M2020 Laser Printer Series manual, page 65
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