Depending on the state of your DVR, you can apply this file using one of two methods: If your DVR still powers on and allows menu access:
: Typically compatible with Winbond chips like the 25Q128 series often found in these Chinese-manufactured CCTV units. How to Use the Dump File
: This repository hosts the dvr-ahb700xt8-3520d_v4.03b_dump_eeprom_not_passwor_by_h2h.rar file. Note that this version is specifically labeled "NOT PASSWORD," meaning it can be used to bypass existing lockouts.