They use a WinRAR or 7-Zip utility to extract the .bin or .rom file hidden inside the archive.
Since the DVR won't boot, they can't use a USB stick. Instead, they must open the DVR casing, identify the 8-pin flash chip on the motherboard, and use a hardware programmer (like a CH341A ) to "flash" the dump file directly onto the chip. The Outcome Download FLASH DUMP DVR 80235 Rev 4CH rar
Once the data is written and the DVR is powered back on, the "Rev 4CH" model springs back to life. It’s as if the machine has been given a fresh brain, restored to its factory-original state, ready to record again. They use a WinRAR or 7-Zip utility to extract the
The technician finally finds the file: FLASH DUMP DVR 80235 Rev 4CH.rar . they must open the DVR casing