Dahua NVR: Unable to reset password

[azn-tuan86]

Hello,

Somebody can help me to reset a password of a Dahua NVR model DHI-NVR4208-8P-4K ?
I tried the reset button as suggested, doesn't work. I also tried to connect with the serial UART interface, but doesn't work as well.

It's so complicated, I did it many times with Hikvision, it always succeeded but i'm really stuck with the Dahua

Thanks in advance
Regards

 

[MC1987]

on serial terminal, stop bootup using *** and type "eracfg" job done

 

[azn-tuan86]

Hello,

The problem is I can't make the serial UART work. Do you have the link of a model which work on this device.

Regards

 

[alastairstevenson]

The problem is I can't make the serial UART work.

Is it RS232 or serial TTL?
If RS232 (DB9 connector) you will likely need a null modem cable to connect.
Or swap pins 2 & 3 around on the connector.

 

[ralliartevo6]

Hi everybody,
thank's a lot for yout help !!!

i have an issue with an nvr 5216. I don't have admin password and all procedures dosen't work.
i 'm testing rs232 connection but with my pc serial port but I don't have connection with nvr.

so i'm testing connection with ftdi232 adaptator.
i have connection but this is my putty screen ...

i have connect GND to pin number 5 of rs232 connector
rx of ftdi adapter to pin 3 of rs232 connector
tx of ftdi adapter to pin 2 of rs232 connector

did you have any idea of where is the problem ?

thank you

bye

 

[ralliartevo6]

hi,

i have also try with usb2ttl but i have the same problem.

please help me !

bye

 

[MC1987]

Change baud rate to 115200 on com port and in Putty, if not try with Tera Term. I see this from time to time

 

[ralliartevo6]

Change baud rate to 115200 on com port and in Putty, if not try with Tera Term. I see this from time to time

Hi,
Thank’s for your response !

I try with all possible bauds rate, with putty, Tera term, realterm, ncom and on my MacBook.
With ftdi232 and usb2ttl but i always have the same problem

 

[ralliartevo6]

Hi,
I use a db9 to usb converter and my problem is solved …

thank you !