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Step 1. Log in to the Network Secure console and go to System > Maintenance > Upgrade.
Step 2. Click Offline Upgrade and then Upgrade to Another Version to go to the Preparation step, as shown in the following figure:
Step 3. Click Upload Package to upload the upgrade package, as shown in the following figure:
Step 4. After the package is uploaded, click Next to back up the configurations.
Step 5. Click Yes to start the upgrade.
Step 6. After the upgrade, click Restart Device to restart the device. After the device is restarted, log in to Network Secure and check the device status.
Do not close the uploading page while uploading the update package. Otherwise, you have to enter the page again and repeat the preceding steps.