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That's quite an old model NVR. What model and firmware version are the cameras you ended up buying? There may be some compatibility issues if there is a big gap in the device ages.

Check your Conversations ...

If the cameras are 'inactive' and the NVR PoE port is set to Plug&Play all that's needed is to connect the camera to the NVR PoE port. The NVR will activate the camera, set the password as configured in the NVR and set the camera IP address automatically.

What version of CN firmware did you apply?

You should be able to play back recordings right up to the minute - there is no 24 hour buffer.

Make / model of NVR and cameras? Do you get the same issue if you access playback via the VGA/HDMI interface?

That's a pity. A bit of a long shot - but there are quite a few newer versions of the NVR firmware here, mostly bugfixes / compatibility problems ...

Is h.265 enabled on the camera? The E-series NVRs don't support that codec.

Are you recording to a Hikvision NVR? In the web GUI, under System, tick the box 'Enable rules' and all triggered events will show on the video.

As it doesn't look like the firmware update has also cleared the configuration, it may be worth checking (this varies from model and manufacture date) is if there is a command still in the bootloader to erase the config. Sometimes something like erasecfg Interrrupt the bootloader, then use 'b'...

Yes, the same error triggering the reboot. My guess is it's a hardware fault, unfortunately.

The capabilities are coded into the bootpara data that's written into the flash during manufacturer - the firmware isn't different, it just adapts to the hardware it's executing in. The more channels and the higher processing bandwidth, the more RAM, clockspeed and CPU / DSP cores are in the...

What elements are ticked in the camera web GUI under System | System settings | Metadata tab ?

Yes, the PC on your LAN that must be running a standard tftp server, not the Hikvision tftp updater which has a 32MB filesize limit. The one from Phiippe Jounin usually works OK. https://pjo2.github.io/tftpd64/ There can be issues in updating from the V3.x firmware to the V4.x firmware if the...

Judging from the (C) and (D) suffixes, that firmware is for current hardware variants of the NVR model you've quoted. If your full model number doesn't have such a suffix, you could try the firmware from here ...

Well done for getting there! I'm speculating that the reboot is caused by a hardware fault. It looks like the watchdog timer (wdt) has expired and forced a reboot. wdt is a hardware timer that needs to be periodically 'fed' (re-initiallised) by CPU activity. If it runs down, it indicates a CPU...

Where are you looking for the firmware?

If the serial interface is working correctly, you'll see lots of chat from the NVR when it's powered on without having to issue any commands.

That's not a configuration file. How did you create it?

Did the item description mention that it was wired as a null modem connector? (link?) edit Though I see above that you said it didn't.

The standard also includes the connectors, so if one of the USB converters cable end fits the NVR, well and good. But generally the null modern cable would be needed to match up the gender and the signals.

In the RS-232 serial comms standard there are 2 types of equipment - DTE (Data Terminal Equipment, eg a PC) and DCE (Data Communications Equipment, eg a modem). These are wired such that TX (Transmit Data) on the DTE connects to RX (Receive Data) on the DCE and vice versa. There are also various...

The web browser on your PC or laptop, using the camera IP address in the browser address bar.

Well done! A good result, and thanks for sharing.

A good result, well done for getting there and figuring a few things out!

I'm guessing a bit - re-installing the firmware doesn't always also reset the device to default settings. And I don't see a erasecfg command in your help list above. Set the PC IP address to match what's shown for serverip above, start a normal tftp server and have the digicap.dav firmware file...

Hikvision have obscured the bootloader commands. Try : setenv ';printenv' setenv ';help'

I'm pretty sure all that battery does is maintain the system clock when power is off. None that I'm aware of for that model. This will provide access to the serial console. You'll need a USB to RS-232 (not serial TTL) convertor, and a null modem cable, widely available on eBay. You'll be...

These are not config files, they are just password reset request files, no passwords contained in them.

Suggestion - with the caveat that I've not seen the web GUI of the -NXI series of NVRs, so you may have to search for the right part of the menu : Assumptions - you've set the new NVR admin password to be the same as the old one, and you know the admin password for the cameras, will be either...