ASUS ZenWiFi XD6 Series(XD6/XD6S)
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BIOS & FIRMWARE

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Firmware
ASUS ZenWiFi XD6 Series(XD6/XD6S) Firmware version 3.0.0.4.388_25572
Version 3.0.0.4.388_25572
76.88 MB
2026/05/12
SHA-256 :756A48472B85942169348CF60BBC41F1B0AAAE18BCA83FE5B8D7F3F61CC6BE19

Security Fixes
- Enhanced DNS name handling to address a potential memory issue that could occur in rare cases during name format conversion, improving system security and robustness.
- Improved safeguards for execution modules to reduce the risk of substitution during certain processes.

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ASUS ZenWiFi XD6 Series(XD6/XD6S) Firmware version 3.0.0.4.388_25569
Version 3.0.0.4.388_25569
76.88 MB
2026/03/18
SHA-256 :562CAEE020B739DB537C14FC2688CD48B1E6AF91EF76CAE370774DDBF9CE364F

Improvements:
- Optimized Wi-Fi roaming stability for devices supporting 802.11k but not allowing 11v.
- Improved Wi-Fi roaming compatibility and stability for iOS 26 devices.
- Refined accessibility-related UI and interaction details.
- Improved overall remote connection stability.
- Improved system behavior when using System diagnostic on feedback page.

Security Enhancements:
- Strengthened input sanitization mechanism
- Enhanced system API validation for stronger protection consistency.
- Strengthened command handling and system resource access controls.
- Improved system logging and security event recording mechanisms.

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ASUS ZenWiFi XD6 Series(XD6/XD6S) Firmware version 3.0.0.4.388_25541
Version 3.0.0.4.388_25541
76.81 MB
2026/01/15
SHA-256 :ABDD9416A026CECFD70481B6057C0D718D9FF897C877348CF60EFB158F0B66D5

Security Enhancements:
-Strengthened input validation and data processing workflows to further protect information security.
-Enhanced AiCloud password protection mechanisms, safeguarding against unauthorized access attempts.
-Enhanced device security through improved buffer handling in connection features.
-Refined data handling processes, ensuring secure and accurate information management.
-Enhanced file access control mechanisms, promoting a more secure operating environment.
-Strengthened certificate protection, providing enhanced data security.
-Enhanced input parameter handling techniques to improve data processing stability and system security.
-Password Policy Upgrade – Minimum of 10 characters, including at least one letter, one digit, and one special character; disallows 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.
-Enhance system access control mechanisms.
-Addressed multiple security weaknesses 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.

Bug Fixes and Enhancements:
-Fixed the UI compatibility issue with the Chrome browser update.
-Improved compatibility with IoT devices on WPA2/WPA3 networks.
-Fixed client binding issues in Mesh scenarios.
-Enhanced input validation and refactored legacy string handling routines to ensure robust memory management.
-Implemented comprehensive validation and expanded command filtering in the web history API.
-Fixed a privilege escalation vector in the IFTTT token exchange mechanism.
-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.
-Stability enhancements.

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ASUS ZenWiFi XD6 Series(XD6/XD6S) Firmware version 3.0.0.4.388_23813
Version 3.0.0.4.388_23813
73.79 MB
2024/10/21

1. Optimized memory management mechanisms, improving system efficiency and stability.
2. Strengthened input validation and data processing workflows, further protecting your information security.
3. Improved web rendering engine, enhancing browsing experience and security.
4. Enhanced security of system command processing to guard against potential malicious operations.
5. Perfected JavaScript-related security mechanisms, offering a more secure web interaction environment.

Please unzip the firmware file, and then verify the checksum.
SHA256: 68279764f847e555b8409e77e1d6ad8925dd02a4324c4bbfa66b2e1bea0f75bd

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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.
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    • 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 specifications. Actual performance may be affected by network and service provider factors, interface type, and other conditions. Connected devices must be 802.11ac-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.
    • The device is restricted to indoor use only when operating in the 5150-5350 MHz frequency band in certain regions, including the EU, Asia-Pacific countries, Australia, and Canada. Outdoor use in this band may be prohibited or require regulatory approval. Check local regulations before deployment.
    • 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.