Do not download firmware from random file-sharing sites (Mediafire, Mega, or obscure forums) without checking file hashes first. Here are the safest sources:

Users typically look for firmware updates for the HG8321R for three reasons:

This method works if your current firmware has the "System Tools > Firmware Upgrade" option enabled (most ISP firmwares hide it).

Step 1: Prepare the file

Step 2: Access the hidden upgrade page Even if the menu button is missing, try this direct URL: http://192.168.100.1/html/management/firmware.asp

Or for some versions: http://192.168.100.1/firmwareupdate.html

Step 3: Upload & Flash

Step 4: Hard reset after flash After reboot, press the physical RESET button on the back for 10 seconds. This clears old NVRAM settings.