1. Introduction
The NEWFAST AX5400 WiFi6 USB 3.0 Wireless Network Card (Model NF-U353) is designed to provide high-speed, stable, and secure wireless connectivity for your desktop or laptop PC. Featuring WiFi 6 (802.11ax) technology and tri-band support (2.4GHz, 5.8GHz, and 6GHz), this adapter is ideal for gaming, video conferencing, high-definition video streaming, and maintaining an efficient network connection. Its advanced chip and dual antennas ensure reliable signal transmission and reception, even in congested environments.
2. Key Features
- Ultra-High Speed: Up to 5374Mbps wireless rate for a superior internet experience.
- Advanced Chipset: Equipped with the RTL8832CU chip for stable and reliable performance.
- WiFi 6 Standard: Supports IEEE 802.11a/b/g/n/ac/ax protocols for the latest wireless technology.
- Tri-Band Connectivity: Operates on 2.4GHz (574Mbps), 5.8GHz (2400Mbps), and 6GHz (2400Mbps) bands.
- Enhanced Security: Supports WPA3 encryption for more secure wireless connections.
- USB 3.0 Interface: Provides theoretical transmission bandwidth up to 5.0Gbps, backward compatible with USB 2.0/1.1.
- Driver-Free Installation: Automatic driver installation for Windows 10/11, simplifying setup.
- Dual High-Gain Antennas: Ensures stable signal transmission and reception.
- MU-MIMO Technology: Improves network efficiency in multi-device environments.
- Low Latency: Optimized for gaming and real-time applications.
3. Package Contents
Please check the package carefully for the following items:
- 1x NEWFAST AX5400 WiFi6 Wireless Adapter (NF-U353)
- 1x Quick Installation Guide
4. Technical Specifications
| Feature | Specification |
|---|---|
| Model | NF-U353 |
| Chipset | RTL8832CU |
| Interface | USB 3.0 |
| USB Compatibility | USB 3.0 (backward compatible with USB 2.0/1.1) |
| Wireless Standard | IEEE 802.11a/b/g/n/ac/ax (WiFi 6) |
| Operating Frequencies | 2.4GHz, 5.8GHz, 6GHz (Tri-Band) |
| Max Wireless Speed | 5374Mbps (2.4GHz: 574Mbps, 5.8GHz: 2400Mbps, 6GHz: 2400Mbps) |
| Antenna | Dual 2dBi Antennas |
| Security Encryption | WPA-WEP, WPA-PSK, WPA2-PSK, WPA3 |
| Supported Operating Systems | Windows 10 (32/64-bit), Windows 11 (64-bit) |
| Recommended Application | Desktop/Laptop PCs |
| Dimensions (L x W x H) | 85.7mm x 46.7mm x 10mm |
| Heat Dissipation | Supported |
| Certifications | CE, FCC |
5. Setup and Installation
The NF-U353 WiFi adapter is designed for easy, driver-free installation on Windows 10 and Windows 11 systems.
Installation Steps:
- Insert the Adapter: Plug the NEWFAST WiFi adapter into an available USB 3.0 port on your desktop or laptop PC.
- Driver Installation: Wait for your computer to recognize the adapter. The system should automatically detect and install the necessary drivers. If prompted, locate the 'driver disk' (virtual drive) in 'My Computer' or 'This PC' and double-click to initiate the installation.
- Connect to Network: Once the drivers are installed, scan for available wireless networks and connect to your desired WiFi network to complete the setup.

Setup Video Guide:
Video 1: A quick visual guide demonstrating the installation and setup of the NEWFAST AX5400 WiFi6 USB Adapter.
6. Operating Modes
The NEWFAST AX5400 WiFi6 adapter supports two primary operating modes:
- Receive WiFi: Connect your desktop or laptop to an existing WiFi network to access the internet.
- Launch WiFi Hotspot: Create a wireless hotspot from your PC, allowing other devices (e.g., smartphones, tablets) to connect to your internet connection.

7. Advanced Security
The NF-U353 adapter incorporates advanced security features to protect your wireless connections from unauthorized access and threats. It supports WPA-WEP, WPA-PSK, WPA2-PSK, and the latest WPA3 encryption standards.

8. Maintenance
- Cleaning: Use a soft, dry cloth to clean the adapter. Do not use liquid cleaners or aerosols.
- Storage: When not in use, store the adapter in a cool, dry place away from direct sunlight and extreme temperatures.
- Firmware Updates: Periodically check the manufacturer's website for any available firmware updates to ensure optimal performance and security.
- Physical Protection: Avoid dropping the adapter or exposing it to excessive force, which could damage internal components.
9. Troubleshooting
Common Issues and Solutions:
- No Internet Connection:
- Ensure the adapter is securely plugged into a USB 3.0 port.
- Verify that the drivers are correctly installed (check Device Manager).
- Check if your router is functioning correctly and broadcasting a WiFi signal.
- Try connecting to a different WiFi network to rule out router issues.
- Slow Connection Speed:
- Ensure you are connected to the 5.8GHz or 6GHz band for higher speeds, if available.
- Reduce the distance between the adapter and your WiFi router.
- Minimize interference from other electronic devices.
- Update your router's firmware and ensure it supports WiFi 6.
- Adapter Not Recognized:
- Try plugging the adapter into a different USB port.
- Restart your computer.
- Manually check Device Manager for any unknown devices or driver errors.
- Frequent Disconnections:
- Ensure the adapter is not obstructed and has good line-of-sight to the router.
- Check for conflicting software or network settings on your PC.
- Update your network adapter drivers to the latest version.
10. User Tips
- For optimal performance, always use a USB 3.0 port on your computer.
- If your router supports WiFi 6 (802.11ax) and 6GHz band, ensure it's enabled to take full advantage of the adapter's capabilities.
- When using the adapter as a WiFi hotspot, ensure your computer's firewall settings allow for network sharing.
- Keep your operating system updated to ensure compatibility and access to the latest network features.
11. Warranty and Support
The NEWFAST AX5400 WiFi6 USB 3.0 Wireless Network Card (NF-U353) comes with a standard manufacturer's warranty. For specific warranty details, including duration and coverage, please refer to the warranty card included in your product packaging or contact your retailer.
Technical Support:
If you encounter any issues or have questions regarding the product, please contact NEWFAST customer support through their official website or the contact information provided in your product documentation. Please have your model number (NF-U353) and purchase details ready when contacting support.





