Remove the outer screws and open the DVR to access the main board (PCB).
At the U-Boot prompt, enter:
Look at the date and time currently displayed on your DVR’s monitor. Use a Generator: Download or access a super password tool like Superadmin.exe GenSuperPassword.exe Input Details: (exactly as it appears on the DVR) and the unit's Serial Number 7004t-lm-v3 password reset
Please provide the (e.g., Westermo, Moxa, Advantech, etc.) so I can give you the exact reset procedure. Remove the outer screws and open the DVR
Disconnect power and remove the coin-sized CMOS battery from the motherboard for at least 30 seconds. This can sometimes revert the system clock and settings to a state where default passwords work. 7004t-lm-v3 password reset