1. For Pro Series NVRs, (http://www.sunellsecurity.com/products.php?id=39)
Please contact our tech supports or sales to deal with it online
2. For Eco Series NVRs,(http://www.sunellsecurity.com/products.php?id=40)
Please click the "forget passord" in the login interface of GUI, tell us the QR code and we can give you the temp password, then please reset your password in time.