I have a 5216-4KS2-V2
I've upgraded to the DH_NVR5XXX-4KS2_MultiLang_V4.001.0000000.1.R.200319.zip firware, and noticed that a config setting is not saved after a reboot.
After flashing, I've done a master reset and re-loaded my pre-saved config back in. On initial looks, everything looked OK, but I noticed after day 1 , my email notifications stopped. On looking into it, my IVS rules, had their email tickbox unselected. I reselected it and everything started working again. The next day, it stopped, again I checked the IVS rule and the tickboxes were un-selected again. I have my NVR to reboot automatically, this is why it resets the setting.
On finding the issue, if i perform a manual reset it does the same. There may be other settings that are not saving correctly, this is the only one i've noticed so far.
I've also tried , re-flashing, and perform a master reset and set the box up from scratch with 1 camera and 1 IVS rule , it does the same.
Any ideas ? or is it a bug