Q-See QSD2216 - Manual (Page 17)

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5.2.5 Firmware Update
When the cursor moves to FIRMWARE UPDATE, please press enter button, and the firmware
update window will appear.
Update Method: There are two methods to update the DVR firmware, USB (for USB thumb
drives) and Network (not support)
USB update: create a new folder named “firmware” in the USB thumb drive’s root directory, copy
the update file to the folder, and plug in the USB thumb drive. Enter the Firmware Update menu,
select Update Start and press enter button, the system will start updating. When updating is
finished, the window below will be displayed, please manually reboot the DVR.