How to register a USG FLEX H-Series device on the Nebula Cloud platform

Zyxel USG FLEX H-Series firewalls (such as USG FLEX 50H, 100H, 500H, and 700H) are designed for centralized management through the Nebula Cloud platform. To take full advantage of Nebula’s features — such as remote configuration, monitoring, and security service management — your device must first be registered and added to your Zyxel account.

Note: Regardless of whether you plan to use the device in Nebula Cloud mode or in standalone mode, it still needs to be registered to your Zyxel account before it can be fully activated and managed.

This article explains how to register a USG FLEX H device on the Nebula platform, link it to your organization or site, and verify successful activation.

There are three main ways to register your Zyxel USG FLEX H-Series firewall in Nebula Cloud. Each method achieves the same result — adding your device to your Nebula organization and site — but the process may differ depending on whether you are setting up the device for the first time or adding it later.

1. During Initial Setup (First-Time Installation)

USG FLEX H Series [uOS] - Initial Setup USG FLEX H Series Firewall

When you power on your USG FLEX H for the first time and connect it to the Internet, registering your Zyxel device is required to access the web interface, activate security services, and receive firmware updates. Make sure your Zyxel Device can access the Internet. Click Register to go to Nebula Control Centre (NCC) to register your Zyxel Device. NCC is an Internet portal that enables you to manage and monitor groups of Zyxel devices within organisations.

You can just enter your login details if you have an account. Otherwise, you can create a new one.

To register your USG FLEX H firewall with Nebula, please select an Organization and a Site under your authority, or create new ones. You organize Zyxel devices in Nebula into Organizations, for example, "YourCompany" or "YourClient", and Sites, for example, "London Branch" or "Factory".

• Please review your device & license information and follow the prompts in the registration menu to complete the registration of the new device. After all, steps have been completed, you will return to the "Device Registration" step and the registration status will change to "Registered".

• The registration process may take a few minutes. After that, you will see a confirmation that the registration was successful.

Click 'Next' to proceed to the next step.

2. Using the QR Code

Each Zyxel USG FLEX H device has a QR code printed on its label or box.
You can scan this QR code using the Nebula Mobile App (available for iOS and Android).
After logging in, go to Add Device → Scan QR Code, and the device will be automatically registered to your Nebula organization and site.

Registering device in Nebula via QR Code (Mobile App)

Download & Install the Nebula App to your mobile phone via Google Play or App Store Open the Application and Login with an existing account or register a new one You can create a new organization or website if needed.

• Once you are logged into the app, go to the device tab and click "Add Device"
• Find the QR code on your device and scan it
• Scan the QR and follow the menu instructions

3. Manual Registration (Serial Number and MAC Address)

If the device is already running or you don’t have access to the QR code, you can register it manually in the Nebula Control Center (NCC):

1. Log in to your Nebula account.

2. Navigate to Organization > Inventory.

1. Click “Register”.

2. Enter the Serial Number and MAC Address of your USG FLEX H device.

3. Select the desired organization and site, then confirm.

Your device will appear in the inventory and can be assigned or moved as needed.

How to re-register or remove a USG FLEX H-Series device from the Nebula Cloud platform

re-register or remove a USG FLEX H-Series device