The correct .dload or .bin file for 111268500209 B427 should be approximately 25–35 MB. It typically comes with:
If you download an .exe that is 2 MB in size, it is a virus. Do not run it.
Do you really need 111268500209 B427? Consider alternatives:
Cause: The WebUI did not flash correctly. Solution: Re-flash only the WebUI partition. Extract the WebUI folder from the B427 package and run update_webui.bat. Then power cycle.