Dahua NVR4208 Firmware

[kirca]

Hello,

I am a newbie to this forum and I need some help.
I am a owner of a Dahua DHI-NVR4208-4K NVR and I think is a older model of Dahua because I can't find anywhere a firmware for it.
Anywhere I searched for support was different models like 4208-4K2/L, but this is a little different model - here is where I only found the exact model:
NVR DHI-NVR4208-4K 8 CHANNELS DAHUA - 8-channel - Delta
(On the back side it has a RS232)


When it was working it was on the old UI , firmware like 3x......
I was trying to upgrade firmware because it cannot access it via Web or SmartPSS - was giving a error of invalid password, so I somehow updated ( probably with faulty firmware) via USB.

Now I am stuck , or bricked I can't access it.
It boots, it remembers it's IP address, but via Web I can't log in (again invalid Password), also SmartPSS. Via HDMI onscreen interface the buttons are without name or letters in it, so basically I don't know what I input or what I press.

Please, can someone help me.

 

[kirca]

Somehow I logged into the NVR, browse through the menu "on blind", so at this moment I only need the original firmware for that model.
Please, someone?

 

[kirca]

Hello again,
Somehow I managed to get back the firmware and see again the menu, but now it is locked with a password and I can't access it.
Tried with all default passwords, tried with holding the button inside, removing battery... but nothing helps.
Can somebody help me how to reset the password ?