Surveillance devices are frequent targets for botnets (e.g., Mirai). Older firmware (v4.00 or v4.01) often has backdoor vulnerabilities. The R11 release usually addresses these by closing Telnet ports and updating SSL certificates for HTTPS access.
: Log into your recorder and navigate to [System Info] > [Version] . v403r11 h264 h265 dvr nvr firmware download hot upd
Pro tip: Take a photo of the version screen with your phone. Surveillance devices are frequent targets for botnets (e
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