Dahua NVR5216 hard reset?

The FW version must be an older version as it looks MS XPish with the graphics. See the attached photos
You have version 3 firmware. The latest is version 4. I'm running a fairly old 5216-4ks2 with version 4 firmware and as of a couple months ago it worked with P2P, although the smartPSS and DMSS apps had to be upgraded with newer versions. Be careful if upgrading the firmware. There are V1 and V2 hardware versions of the 5216-4ks2, and the V1 hardware cannot use the newer V4 firmware. Ironically, the V3 firmware firmware won't tell you which hardware version NVR you have (the V4 firmware does tell). I believe you can find out from the part number sticker on the NVR case. My V1 NVR say its part number is 1.0.01.23.10840. I vaguely remember the V2 stickers say something to that effect, but don't remember the details.
 
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You have version 3 firmware. The latest is version 4. I'm running a fairly old 5216-4ks2 with version 4 firmware and as of a couple months ago it worked with P2P, although the smartPSS and DMSS apps had to be upgraded with newer versions. Be careful if upgrading the firmware. There are V1 and V2 hardware versions of the 5216-4ks2, and the V1 hardware cannot use the newer V4 firmware. Ironically, the V3 firmware firmware won't tell you which hardware version NVR you have (the V4 firmware does tell). I believe you can find out from the part number sticker on the NVR case. My V1 NVR say its part number is 1.0.01.23.10840. I vaguely remember the V2 stickers say something to that effect, but don't remember the details.
This NVR part number is 1.0.01.23.10842
 
Comparing this NVR to the open box Dahua NVR I purchased - this one does not have a reset button, but the open box NVR does. This NVR says "NVR" on the front panel while the open box Dahua NVR says "Dahua". I'm getting the feeling that the "NVR" branded NVR is an OEM Dahua, which can be an older model. Both are NVR5216-16P-4KS2, but the open box model Dahua is a NVR5216-16P-4KS2E.

I wonder if this NVR is even 4K capable
 
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You have version 3 firmware. The latest is version 4. I'm running a fairly old 5216-4ks2 with version 4 firmware and as of a couple months ago it worked with P2P, although the smartPSS and DMSS apps had to be upgraded with newer versions. Be careful if upgrading the firmware. There are V1 and V2 hardware versions of the 5216-4ks2, and the V1 hardware cannot use the newer V4 firmware. Ironically, the V3 firmware firmware won't tell you which hardware version NVR you have (the V4 firmware does tell). I believe you can find out from the part number sticker on the NVR case. My V1 NVR say its part number is 1.0.01.23.10840. I vaguely remember the V2 stickers say something to that effect, but don't remember the details.
Ok, so you still use a V1 with Version 3 FW?
 
Ok, so you still use a V1 with Version 3 FW?
My V1 5216-4ks2 originally ran V3 firmware. A few years ago I upgraded to a fairly early version of the V4 firmware. I do not use the very latest V4 firmware that I could be using.

Detail you probably don't care about:
Somewhere during the V4 firmware evolution, dahua added code to prevent the NVR from working with chinese market cameras. The firmware version I use is the newest one that doesn't reject the chinese market cameras.
 
mine is a 4K2SE

V4.002.0000000.7.R, Build Date: 2024-07-17

Thats the FW that was required to upgrade to last year when the made all the changes to their P2P service. Anything older is iffy on whether it will communicate with the legacy P2P servers?

Come to find much of the problem wasnt so much the NVRs as it was SmartPSS and how it communicated with the P2P servers. Thats why/when they dropped support for SmartPSS and forced SmartPSS Lite