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Hi, I am always buying branded hikvision dvr's and put original firmware, always without problem. At this time I have 2 dvr's : 7216HUHI-K2 and similary but 8CH : 7208HUHI-K2. As always I upgrade 7208 with hik firmware, but I can't do it with 7216. I tryied 3 files, always I have reading file...