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Select the newest release matching your region and hardware description.
Open a web browser and type your gateway IP address into the address bar. Log in using your administrator credentials. eg8141a5 firmware update new
The most pressing reason to update is to patch a known security vulnerability. A significant exploit was discovered in mid-2025 and assigned the identifier CVE-2025-49599 . This vulnerability exists in older firmware versions, specifically affecting devices running firmware through V5R019C00S100 . Select the newest release matching your region and
Newer firmwares often include anti-rollback (downgrade protection). Once you upgrade from R019 to R020, you cannot return to R019. If the new firmware has a bug you hate, you are stuck. The most pressing reason to update is to
Connect to the ONT via Wi-Fi or Ethernet and enter the gateway IP (typically printed on the device nameplate) into a browser.
Look at the top navigation menu and select (or Advanced > Maintenance depending on your current software layout).
