Because firmware is ISP-specific, you should visit your provider's help page for the most accurate version info:
Some users share firmware files on forums like Reddit (r/nbn), but caution should be used to ensure the file is legitimate. Step 2: How to Update Firmware (Admin Page) sagemcom f-st 5366 firmware download
Open a web browser and type the default gateway IP address into the URL bar: 192.168.1.1 or 192.168.0.1 (Check the sticker on the bottom of your router for the exact IP). Because firmware is ISP-specific, you should visit your
Click Update or Upgrade . A warning will appear: “Do not power off the device during this process.” Confirm. A warning will appear: “Do not power off
Type 192.168.1.1 or 192.168.0.1 into the address bar and press Enter.
One user on the Whirlpool forums reported that an Optus support representative told them to download the latest firmware from the Sagemcom website, but they could not find it anywhere. The community confirmed that only Optus can push the firmware, and a standard power cycle or reboot from the maintenance menu should trigger the update when it becomes available for your device.