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Hi, install the latest firmware to Hikvision NVR DS-7716ni-i4/16p (NVR_K51_BL_ML_STD_V4.40.015_200616) this worked without problems for 2 days, on the third day Nvr disappeared from the map, I have tried TFTP (ip-192.0.0.128 etc... without any result, my nvr was on firmware 3.4.92 before...