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I tried the reset button several times. I pressed it, disconnected the power and left my finger on the button, reconnected and left my finger on the button for 45 seconds. No beep, nothing. To remove the battery, I thought myself of doing that but as @alastairstevenson wrote, I didn't do it yet.

OK. Thanks. So it should work if I can get the information. Maybe I am lucky and there is someone out there who has done it already with this NVR.

Here is a picture.

Restoring with an image via ttl would be great. Maybe someone knows how?

no rs232 and no ttl. I guess the only ony who can help is Dahua.

There is no Web Gui at all only direct connection to the TV works. So, I guess the main app is not working at all? But is there not a bootloader on the board, if so is there a way to recover it with a null modem cable? e.g. with sat receiver that works. what I think off is to reinstall the NVR...

Here is the result: port 8686 is open? but no access if I try that port.

See the attached file. It says, it is up but all ports are closed. Strange.

Thank you. I would like to solve it by an easy way. But it seems there is no chance. Or do you have another idea? Strange is the fact that I can use the mouse and the menu pops up to start to get into the main menu. All is normal. But login fails. Too bad, I cannot go back to the firmware I had...

The ConigTool does not find it. The ping works. Is there not a brick recovery tool for a NVR? And if this is the case, what do I need to do?

Hello CC, I still get the screen after the box boots several times. Then it stays stable. I can use the mouse but when I try to get into the main menu, I cannot log in. It shows me all users (three in total), I have created. When I try to login as admin with the password I have given, the...

I will try but unfortunately, it is not stable. I tried to log in with the user:admin and my password. But it didn't work. Maybe, I reseted the password to its default. Then I tried to restart the box and the same, the black screen appeared. Therefore, it is a game, either I am lucky or not. I...

I removed the hard drive. Although, I did it with HDMI because I don't have VGA here (only in the office not at home), the dahua titles are there and they stay. It seems to be stable. What schould I do now? There is no setup screen but this is probably due to the fact there is no harddrive...

Thank you catcamstar. I took a deep breath but unfortunately, it did not get my NVR back to run. ;-) Before the upgrade, I did not do a factory reset. I went from v3 to v4. Everything was fine. But I wanted to downgrade back to v3 because I liked it better. I tried with a VGA connector. Same...

The IP is there. Config Tool does not recognize the NVR. :-( But the NVR is gone, also via TV, Dahua logo pops up, shows shortly the 8 titles for the cameras and then the tv is black. Is there no way to play a firmware on the NVR via a USB stick while booting? Any other ideas? I mean, normally...

Is there maybe any chance how i can flash the box with a file?

Yes, I cleared cache and if I try to open ip with port even the mask to login does not show up. @alastairstevenson : This is not for NVR? Is your link not only for cameras ?

I updated to version DH_NVR4XXX-4KS2_MultiLang_V4.001.0000000.0.R.200221.bin then I downgraded to DH_NVR4XXX-4KS2_MultiLang_V3.216.0000002.0.R.190102.bin now, I have a login screen but without showing in the middle TCP -how it was before. - see picture- and if I try to login nothing happens...

Hello Andy, I would like to purchase IPC-HDW5231R-ZE from you. Which price can you give me? It has be sent to Germany. Thanks and regards for a reply. Alex

ok, too bad, but thanks anyway. So the next cameras I buy must have PIR. Any good recommendation for a Dahua PIR camera?

I use tripwire with all my Dahua cameras. So far, it works well. Unfortunately, the tripwire detects all light changes e.g. if the sun comes out or the sun disappears behind some clouds. I know this happens when using motion detection and I hoped tripwire would not act so sensitive to light. Is...

Thanks arisotobrat

Hello, I use a NVR 4109-8p-4ks2. I purchased the above camera from Andy. When I want to setup tripwire it fails. Also with the live view, I cannot see the tripwire lines to test it. Is there something wrong or is the software the wrong one I use? Please help and thanks. Intrusion works well.

I started to read them. Lot's of information. What do you think about the firmware update for the cameras? Should I try or will I brick them? If it works which firmware would you recommend and where can I get it? Thanks.

Sorry SD29204T-GN

Hello, I use Pale Moon Browser and will now follow up on your advice and will do the changes directly on the cameras. In the meanwhile, I can tell "intrusion" as well as "tripwire" works well. Unfortunately, in the night it is hard to identify the face of the person. Can I improve this a little...

Thanks for your replies. It works already better with tripwire. I also set up intrusion now. Let's see what works better. What about the night. There IVS seems not to pick up in the way it does during the day. Is this normal ? Something else? When I change sth. in the settings directly over...

Hello, I am new here and have already read a lot in this forum. I also have read about where to buy and where not to buy via aliexpress. Unfortunately, I already have bought a camera over DragonEye and don't know if it is crap or not. Here is my problem. I have a new NVR NVR4108-8P-4KS2...