Dahua DH-XVR5104HS-4KL-I3 User Manual page 60

Follow the onscreen instructions to get the security code in your reserved email address.
In the Security code box, enter the security code.
You can get the security code twice by scanning the same QR code. If you need to get

the security code once again, refresh the page.
Use the security code received in your email box to reset the password within 24 hours;

otherwise the security code becomes invalid.
Security questions

1) On the Reset password page as shown in Step 3, in the Reset Type list, and then select
Security Questions.
If you did not configure the security questions before, in the Reset Type list, there will be
no Security Questions.
2) In the Answer box, enter the correct answers.
Click Next.
Security questions
51
User's Manual