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BIOS & FIRMWARE

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Firmware
ASUS RT-AX5400 Firmware version 3.0.0.4.388_25340
Version 3.0.0.4.388_25340
48.71 MB
2026/09/21
SHA-256 :136298C3B71A819F0AD356C9C72892EDE38E5F8C937FBC0566C72DC45D0F2675

This update includes a required change for the Speedtest service. If Speedtest is supported on your model, you must install this update to continue using it. Please refer to Speedtest Service Announcement for details.
https://www.asus.com/support/faq/1057454/

Supports Surfshark VPN account login for a smoother user experience. (Supported model only)

Security Fixes
Web management interface: Strengthened data handling for the connected device list and added stricter content checks when importing configuration profiles.
Network speed test service: Added allowlist validation for service command parameters, so that only expected values are accepted.
AiCloud: Strengthened the data handling mechanism for the network neighborhood host list.
AiCloud: Improved how share link identifiers are generated, and adjusted the file and disk information query process.
AiCloud: Strengthened authentication and path validation for remote file access.
System protection service: Adjusted address parameter validation and event logging, strengthening access control between local services.
Certificate import process: Adjusted file handling and password passing, with stricter parameter validation.
Third-party account authorization: Narrowed the recipients of authorization data to better protect authorization information.
Web management interface: Adjusted the output handling of feedback content.
Notification service: Added identity verification for local connection sources and tightened the related file permission settings.
Mobile device connection authorization: Added a device matching check to strengthen the access token issuance process.
Device discovery service: Removed a non-essential internal function endpoint to strengthen overall access control.
AiMesh: Adjusted data access protection during the node joining process, improving system stability while connections are being established.
System temporary directory: Adjusted the default permissions applied at creation time to narrow local file access.
Network diagnostic data query: Strengthened value range checks for time interval parameters.
Network diagnostic data query: Added allowlist validation for query fields.
Internal data query: Improved field matching logic and optimized the memory release process under error conditions.
Time synchronization settings: Strengthened parameter validation for the server name.
File upload handling: Fixed an issue where certain input formats could cause the web management service to become unresponsive.
Wireless channel selection tool: Adjusted the handling of command parameters to prevent unintended command execution.
Certificate upload: Added a pre-check of archive contents to prevent files from being written to unintended locations.
System configuration file generation: Strengthened parameter content checks to prevent abnormal configuration values from affecting network service settings.
VPN and account authentication services: Adjusted the handling of connection settings and account data, with stricter parameter validation.

We recommend updating to this version to maintain optimal protection.

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ASUS RT-AX5400 Firmware version 3.0.0.4.388_25288
Version 3.0.0.4.388_25288
48.44 MB
2026/08/04
SHA-256 :CB16F4E1E4160173B9183B6DCF54D7615DF8610F643175A4C794F1F62450B0C5

New Features
- New Time Zone Options: Added "Vancouver, Whitehorse (PST7)" and "Edmonton, Yellowknife (MST6)" time zone options for Canada.

Bug Fixes and Enhancements
- Improved stability during the AiMesh node setup process.
- Strengthened firewall rule configuration for UPnP, improving port-forwarding stability and firewall rule restoration reliability.

Security Fixes
- Strengthened data handling in Networks configuration functions.
- Improved data validation in Networks rule list processing.
- Fixed a data-handling issue in the DNS query caching component.
- Strengthened verification when a software component downloads external resources, improving connection security.
- Adjusted the information response mechanism of the device discovery service, strengthening protection of device information.
- Fixed a data-handling issue in a firmware component on a specific model.
- Strengthened input data validation in a device-pairing web function.
- Improved data validation in the configuration file upload/sync function.
- Improved how the account service restart process is handled.
- Removed a non-essential internal function endpoint, strengthening overall access control.
- Adjusted the debug file access mechanism, strengthening protection of internal data.
- Strengthened data handling in the system logging function.

We recommend upgrading to this version to maintain optimal protection.

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ASUS RT-AX5400 Firmware version 3.0.0.4.388_25247
Version 3.0.0.4.388_25247
48.26 MB
2026/03/12
SHA-256 :0500B801C75FDF667DB28E5C3E73A33BF33AD283CDC10F5C57A84F7CF695D255

Security:
-Strengthened input sanitization mechanism.

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ASUS RT-AX5400 Firmware version 3.0.0.4.388_25204
Version 3.0.0.4.388_25204
48.25 MB
2025/10/20
SHA-256 :7B5366E823E18E6C92C6402F9897DA08E69EAC954954F7EC037E5D9BA14EB990

- Enhanced system stability.
- Enhanced input validation and refactored legacy string handling routines to ensure robust memory management.
- Mitigated security risks in AiCloud service by enforcing strict credential verification, implementing robust file path validation, and hardening command execution logic to prevent unauthorized access and manipulation of system resources.
- Implemented comprehensive validation and expanded command filtering in the web history API.
- Strengthened input validation and directory handling in the VPN configuration upload interface.
- Fixed an issue that allowed certain user settings to be bypassed, improving overall user control and protection.

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ASUS RT-AX5400 Firmware version 3.0.0.4.388_25192
Version 3.0.0.4.388_25192
48.25 MB
2025/08/27
SHA-256 :5D4C071903C61762961B5B6381BF7D2A02A1A94F2F824EEACA825C2E82A37E62

Important: After installing this firmware, we strongly recommend performing a factory-default reset to activate every new security adjustment.

Security Enhancements
- Password Policy Upgrade – Minimum 10 characters with at least 1 letter, 1 digit and 1 special symbol, and no consecutive identical characters; hardens defense against brute-force attacks.
- HTTPS on 8443 – Management interface now served over TLS by default.
- UPnP Disabled – Universal Plug and Play starts in the off state for reduced surface exposure.
- AiCloud Authentication Hardening (CWE-287) – Added layered verification.
- Authentication Logic Refactor – Removed redundant code paths for a lean sign-in flow.
- Memory Safety Guard (CWE-476) – Introduced null-reference protections across critical services.
- Enhanced IPsec Parameter Validation – The existing input checks have been hardened
- Data Exposure Mitigation (CWE-200) – Reinforced controls on sensitive pathways.
- Detailed Audit Trails – Expanded logging within the authentication module.

System Improvements
- Connection Stability – Core algorithms refined for steadier links.
- Scheduling Accuracy – Timed tasks execute reliably under PPPoE, PPTP and L2TP WAN modes.
- Client List Maintenance – Resolved an issue that prevented offline devices from being removed from the client list.

Bug Fixes:
- Fixed abnormal client list.
- Fixed abnormal GUI behavior of Wireguard VPN.
- Fixed USB internet backup conflict with main WAN.
- Fixed abnormal WAN detection while AiDetection is enabled.
- Improved AdGuard DNS GUI issues.
- Fixed IPv6 related issues.
- Improved USB tether compatibility for pixel phones.

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ASUS RT-AX5400 Firmware version 3.0.0.4.388_25144
Version 3.0.0.4.388_25144
48.27 MB
2025/04/22
SHA-256 :E561002C4ADE47B036ADB132319E9E0C86356C04A3A2233307EB71FB3E2A6118

Improved compatibility with certain IoT devices.

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ASUS RT-AX5400 Firmware version 3.0.0.4.388_25142
Version 3.0.0.4.388_25142
48.27 MB
2025/02/25
SHA-256 :3F67CD8C232F091863D9233816C45C0632515E84B7CCF2D1C6B2CEC4E65BDA94

1.Enhanced input parameter handling techniques to improve data processing stability and system security.
2.Enhance system access control mechanisms.

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ASUS RT-AX5400 Firmware version 3.0.0.4.388_25137
Version 3.0.0.4.388_25137
48.3 MB
2025/02/14
SHA-256 :FF89074C11E271B6A2ADA8C711A7D4BD5DC12AE5E45654F6903F546DFDA55232

1.Fixed the UI issue in Chrome.
2.Fixed client binding issues in Mesh scenarios.

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ASUS RT-AX5400 Firmware version 3.0.0.4.388_25128
Version 3.0.0.4.388_25128
48.3 MB
2024/11/28

Please unzip the firmware file, and then verify the checksum.
SHA256: 263ba5196f9b5d8cf0dcdc5e79051aa338fe0d23a681bc326d30ce38bf34792f

Improved the ability to modify the HTTPS port in AP mode via the web UI.

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ASUS RT-AX5400 Firmware version 3.0.0.4.388_25127
Version 3.0.0.4.388_25127
48.3 MB
2024/11/06

1. Strengthened input validation and data processing workflows to further protect information security.
2. Enhanced AiCloud password protection mechanisms, safeguarding against unauthorized access attempts.
3. Enhanced device security through improved buffer handling in connection features.
4. Refined data handling processes, ensuring secure and accurate information management.
5. Enhanced file access control mechanisms, promoting a more secure operating environment.
6. Strengthened certificate protection, providing enhanced data security.

Please unzip the firmware file, and then verify the checksum.
SHA256: 1cc7d3206cfbd89a54a099a973d9c44a279b55144c7bd97f25d99445ade19e7d

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ASUS RT-AX5400 Firmware version 3.0.0.4.388_25119
Version 3.0.0.4.388_25119
48.25 MB
2024/10/16

1. Strengthened system code execution processes.
2. Enhanced AiCloud password protection mechanisms, safeguarding against unauthorized access attempts.
3. Refined input validation in the web interface, ensuring a more secure web interaction environment.
4. Improved data export functionality in the admin portal, ensuring accurate and secure handling of client information.
5. Optimized memory management mechanisms, improving system stability.
6. Improved system buffer management, ensuring reliable data processing workflows.
7. Enhanced stack buffer management, promoting greater system stability.

Please unzip the firmware file, and then verify the checksum.
SHA256: d155df280e4e64cea5efef8468a6b9eeec6038fd73f0ee73a2cea1c4ee0ec694

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  • Products certified by the Federal Communications Commission and Industry Canada will be distributed in the United States and Canada. Please visit the ASUS USA and ASUS Canada websites for information about locally available products.
  • All specifications are subject to change without notice. Please check with your supplier for exact offers. Products may not be available in all markets.
  • Specifications and features vary by model, and all images are illustrative. Please refer to specification pages for full details.
  • PCB color and bundled software versions are subject to change without notice.
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  • The terms HDMI and HDMI High-Definition Multimedia Interface, HDMI trade dress and the HDMI Logos are trademarks or registered trademarks of HDMI Licensing Administrator, Inc. in the United States and other countries.
    • The actual transfer speed of USB 3.0, 3.1, 3.2, and/or Type-C will vary depending on many factors including the processing speed of the host device, file attributes and other factors related to system configuration and your operating environment.
    • Actual data throughput and WiFi coverage will vary from network conditions and environmental factors, including the volume of network traffic, building material and construction, and network overhead, result in lower actual data throughput and wireless coverage.
    • Quoted network speeds and bandwidth based on current IEEE 802.11ac/802.11ax specifications. Actual performance may be affected by network and service provider factors, interface type, and other conditions. Connected devices must be 802.11ac/802.11ax compatible for best results.
    • WPA/WPA2 enterprise is only available on single router, is not available under AiMesh mode.
    • When traditional QoS is enabled, there will be limitations due to the actual Internet service bandwidth and different environment, and there may be a risk of speed reduction.
    • Due to the different power supply requirements on USB external hard disk and 4G/5G Modem device, to ensure that the external device can be used stably, if the USB external device exceeds the standard USB 2.0 (5V/500mA) and USB 3.1 Gen 1 (5V/900mA) power supply requirements, you need to use it with an independent external power supply.
    • If you use the product in conjunction with a third party service, you are responsible for complying with the third party provider's terms and conditions and privacy policy and are also at the risk of such use. ASUS does not provide support or guarantee continuous integration support for products that are not part of ASUS.
    • For models with Time machine support, starting with macOS 26 (Tahoe), Time Machine no longer supports creating new backups on USB-connected storage devices. Existing Time Machine drives that were previously configured remain compatible and can continue to be used for backup and restoration.