Do not use random file-sharing sites (e.g., MediaFire, Zippyshare) or third-party torrents for firmware. Industrial routers are prime targets for supply chain attacks. Malicious firmware could install backdoors.
Enter http://local.html or the IP address 192.168.1.1 in the address bar. hvt-jmr1040-r3.53 firmware download
If the manufacturer does not host the files publicly, contact the authorized distributor from whom the hardware was purchased. They often have access to private FTP servers containing the latest firmware binaries. Do not use random file-sharing sites (e