Dahua 4208-4K

[kirca 0]

Hello to all,

After firmware update I can't log into my NVR.
It is a Dahua DHI-NVR4208-4K NVR, older model of Dahua and anywhere I searched for support was different models like 4208-4K2/L.
After the firmware update it remembers it's IP Address, but now I cannot login - available accounts for login: 888888, admin, 666666
There is a button on the motherboard, but holding it ~30 sec. doesn't make a change.

Tried all the previous passwords, or even the factory defaults but I still can't log into.

It is on the 3x UI.

Thanks for helping!