Do you have access to the originally used to set it up?
I can help by finding the specific manual for your model if you share the manufacturer name. If you are locked out, you can: dvr login password
If you lose your password, several recovery mechanisms may be available depending on the brand: ─ 4CH DVR ─ Do you have access to the originally used to set it up
Unplug the power cable before opening the device to avoid electrical shock or damaging the components. Unscrew the outer casing of the DVR. dvr login password