Yep, if you changed your password on your cameras, the NVR still tries with the saved password and locks the account... so it's smart to have at least one extra account which is only used for your administration jobs, so it won't get locked out. Just create an own user for the NVR on the cams. After you have successfully logged into your NVR again go into settings -> remote device and change the user/pass setings to fit the new password or user/password. To avoid the NVR from locking the cams again while you are trying to change the settings, it would be better to separate the cams into antoher network or: delete the cams first in your NVR, reboot your cams and get logged in directly to the cams after the account is unlocked. Add a new user for the NVR on each cam. After you are done re-add the cams with the new user/pass to your NVR.