If your device is actually the HG6245D , the TOP firmware will work. If it is strictly HG6243C , you likely cannot use the standard TOP builds available on public forums. If your device is actually the HG6245D ,
The keyword "download firmware fiberhome hg6243c top" should now be clear: When in doubt, let your ISP handle it. A bricked ONT means losing internet until a technician replaces it – and that cost is far higher than any perceived performance gain from a rogue firmware file. download firmware fiberhome hg6243c top