If you cannot generate a reset file because the DVR is completely locked or unresponsive, you can physically reset the device.
Because of this, the method often works for a wide range of Chinese-made surveillance recorders. The internal firmware is based on HiSilicon chipsets, which share common backdoors and reset protocols.
This method works only if the DVR is connected to the internet or if you registered an email address with the device during initial setup.
, but the box was old, and he'd long since changed the default settings. He remembered reading somewhere that default passwords