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Older firmware on the FTP site (pre-2020) are famously vulnerable to Hikvision backdoor exploits (CVE-2017-7921, CVE-2021-36260). If you download an old version from the FTP server just to "test," your device will be compromised within minutes of connecting to the internet.
Never download firmware from a random FTP link posted in a forum. Always verify the SSL certificate or hash if you access ftp.hikvision.com directly. And before you hit "upgrade," read the Release Notes—because the wrong firmware doesn't just fail; it destroys. hikvision firmware ftp
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