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I have DS-7604NI-K1 / 4P with 4 cameras in place from the last few years and it does give hard drive errors quite often. Was wondering what will be an upgrade if I am looking to get it done? Thanks in advance

May I ask for help on my NVR, it is running on V3.4.80 build 160718 since I got it installed and has failed any update I tried a few times in the past. not even taking NVR_K41_BL_EN_STD_V3.4.103_181226 ( this was a minor update) and comes back with failed to update the device message. Is...