How to reset NHD-851? Follow Where is the reset button? Unscrew and remove the camera's dome cover. Disconnect and reconnect power (Ethernet cable from NVR or PoE switch to the camera), then press and hold the reset button for 10 seconds. Related articles Where to get the model number? Swann Security Password Reset Re-registering SwannCloud Cameras Camera Firmware Update for OS 5 NVRs SwannView Link Password Reset Comments 0 comments Article is closed for comments.