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Connect PC to DVR via RS232 cable and launch Hyper Terminal application.
Set up connection name, icon, and select the appropriate COM port for the DVR.
Configure COM port settings in Hyper Terminal: Bits per second, Data bits, Parity, Stop bits, and Flow control.
Type 'resetPasswd' in Hyper Terminal to start the DVR password reset process.
Send DVR serial number and date to obtain a secure code, then input it to reset the password.