If you cannot find the file on the public website, you may need to contact Hikvision Technical Support directly, as older models (like the "-F1" series) are sometimes moved to End-of-Life (EOL) support archives. 4k%e5%bd%b1%e9%99%a2-iu%e9%9b%86%e5%ae%a2%e5%bd%b1%e9%99%a2 - 3.79.94.248