This is not a binary file; it is often an XML or CFG text file. If your browser downloads it, open it with Notepad++ or VS Code. What you can find inside:
On some hidden sub-pages, there is a button labeled Reset to Factory (including Boot Parameters) . A standard reset keeps your calibration data (DSL line tuning). This "deep reset" wipes the antenna calibration. Your router may never sync at the same speed again. sagemcom fast 5364 hidden menu
Some users modify this file offline (changing WifiPower from 0 to 1 to unlock region codes) and re-upload it via the firmware update page. This will brick your router if you make a syntax error. This is not a binary file; it is
