Unfortunately this tool hasn't worked for me.
The backdoor it uses is for cameras, not NVRs.
Software version is 3.x.x.
Can you be more specific about the firmware version? SADP will show that for you if you are unsure.
Hangzhou Hikvision Digital Technology Co. Ltd.
I do have a 'Forgot Password' link, when I click this I have the option to import a file to reset the password.
You would have had to have exported the GUID file as your safety net - it's one of the ways to do a self-service password reset, along with the 'security Q&A' method.
One way to do a 'reset to defaults' is to carry out a
tftp update to (ideally) the same firmware as already installed, as shown by SADP.
So, a suggestion:
As your NVR is an -NI version, plenty of firmware version choice here : (unfortunately the Hikvision EU portal is down right now, but this should be OK :
NVR)
Download the same version as shown in SADP.
Use the Hikvision tftp updater tool from the second link here :
Custom Firmware Downgrader 5.3.0 Chinese to 5.2.5 English
Save it in the same folder as the firmware you downloaded.
Change the PC IP address to 192.0.0.128 , ensure it uses a wired (as opposed to WiFi) connection.
Start the tftpserve.exe program, cliick 'OK' at the Windows firewall prompt.
Power cycle the NVR, watch the tftp updater status window.
Hopefully see an 'update completed' message on the tftp updater window.
Reboot the NVR, into an 'Inactive' state as seen by SADP, activated by applying your own choice of strong password via SADP.
If all that doesn't work, set the PC IP address to 192.168.1.128 instead of the 192.0.0.128 and repeat.
Good luck!
And if that works OK - do the 'Forgot password' process so you can self-service reset next time.