Q-See QSC26408 - Manual (Page 98)

User Manual for Commercial Series Net DVR
Page
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7.3 Upgrade
You can use this function to upgrade the firmware.
Press “Upgrade” icon, in the pop-up dialog, you can select either “FTP” or “USB” upgrade
mode.
If you select “FTP” mode, you will enter into “FTP Upgrade” menu:
Input the ftp server IP and press
【ENTER】key. DVR will connect with FTP server through
network and download the firmware file.
If you select “USB” mode, please make sure you connect one USB flash memory to USB
port on the DVR and that the firmware file is in it’s root directory.
Reboot after successfully upgrading, the system will use the new firmware.