Optus Ultra WiFi (Gen 2) Modem Setup & Troubleshooting
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Setting up the Optus Ultra WiFi (Gen 2) modem – the Sagemcom F@st 5366? Here’s how to connect it, what the lights mean, and how to log in, plus expert Aussie help if it won’t come online. The Original PC Doctor sets up and fixes Optus modems Australia-wide, no fix no fee.
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About the Optus Ultra WiFi (Gen 2) modem
The Optus Ultra WiFi Gen 2 is the Sagemcom F@st 5366 — a Wi-Fi 6 gateway with four Gigabit LAN ports, built-in 4G backup, and support for Optus WiFi Booster pods for whole-home coverage. It works on NBN FTTP, FTTN, FTTC and HFC.
Setting up the Optus Ultra WiFi (Gen 2) – step by step
- Connect the modem to your NBN connection box (or wall socket for FTTN) with the supplied cable.
- Plug in power and switch on – lights will cycle while it starts.
- Activate the service in the My Optus app if prompted, and allow the first firmware update to finish.
- Wait for the Internet light to turn solid blue – you’re online.
- Connect your devices using the Wi-Fi name and password on the modem’s base label.
Ultra WiFi (Gen 2) status lights
| Light | Meaning |
|---|---|
| Internet – solid blue | Online via your fixed NBN connection |
| Internet blue + 4G Backup green | Online via 4G backup (fixed line is down) |
| Internet off + 4G Backup red | No internet and no working backup |
| Telephone – solid green | Home phone connected |
To use 4G backup, check the SIM is seated, then power-cycle (off 30 seconds, on). Logging in for settings? Browse to 192.168.0.1 with the credentials on the base label.
Common Optus Ultra WiFi modem problems we fix
- Internet light won’t turn blue
- 4G Backup light is red
- Can’t find the Wi-Fi details
- Booster pods won’t pair
- Slow Wi-Fi or dead spots
- Activating the service in the My Optus app
The Ultra WiFi Gen 2 (Sagemcom F@st 5366) needs the correct NBN port for your technology type plus a first-run activation, so most ‘no internet’ cases are a port or activation issue rather than a faulty modem.
Why The Original PC Doctor
- Since 2001 — 24+ years of Australian computer & network support
- No fix, no fee — you only pay if we solve it
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- All NBN types — FTTP, FTTN, FTTC, HFC, plus 4G/5G backup
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Frequently asked questions
How do I set up the Optus Ultra WiFi Gen 2 modem?
Connect it to your NBN box or wall socket, power on, activate in the My Optus app if prompted, wait for the Internet light to turn solid blue, then join Wi-Fi using the details on the base label.
What does a blue internet light mean on the Optus modem?
Solid blue on the Internet light means you’re online via the fixed NBN connection. If the 4G Backup light is also green, you’re running on 4G backup because the fixed line is down.
What is the login for the Optus Ultra WiFi modem?
Browse to 192.168.0.1 and use the credentials printed on the base label (commonly username optus with the Wi-Fi password, or admin/admin on older Sagemcom models).
Does the Optus Ultra WiFi Gen 2 support booster pods?
Yes – it’s a Wi-Fi 6 modem with four Gigabit LAN ports and supports Optus WiFi Booster pods for whole-home mesh coverage.
More Optus modem guides
← Back to the Optus Modem Setup & Support hub.
Optus 5G Home Internet modem setup · Optus modem lights meaning · Optus modem login & password
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