LT Security LTN7600 Series NVR (V2.2.3) - Manual (Page 189)

User Manual of DS-9600/8600/7700/7600 Series NVR
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Figure 12. 14 FTP Upgrade Interface
3. Enter the FTP Server Address in the text field.
4. Click the Upgrade button to start upgrading.
5. After the upgrading is complete, reboot the NVR to activate the new firmware.