Since most modern DVR boards like the 7004T-LM-V3 store passwords in flash memory, unplugging the battery rarely works. Instead, you can use a "Super Password" generator: Experts Exchange Note the Date:
If the hardware bridge doesn't work, you may be able to restore defaults through the boot menu. 7004t-lm-v3 password reset
7004T-LM-V3 is a 4-channel AHD DVR motherboard manufactured by Hangzhou Xiongmai Technology Since most modern DVR boards like the 7004T-LM-V3