LT Security LTN8600 Series NVR (V2.3.2) - Manual (Page 197)

User Manual of 9600/8600/7700/7600 Series NVR
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Figure 13. 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.