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hikvision nvr upgrade

  1. S

    NVR UPGRADE

    Hi everyone ... I have hikvision NVR DS-9664NI-I8 I have upgrade it from 3.4.X version to NVR_K51_BL_ML_STD_V4.21.008_190625 Before upgrading I can playback all the records ... After upgrading I couldn't do it What can I do??
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