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Disconnect the power cable from the back of the DVR.

Here’s a general write-up regarding the — useful for troubleshooting, system recovery, or regaining access to a locked DVR. tronitek dvr admin password

Leave the battery out for 10 to 15 minutes. Press and hold the DVR's physical power button (if it has one) for 30 seconds to drain remaining capacitance. Disconnect the power cable from the back of the DVR