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BIOS & FIRMWARE

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Firmware
ASUS RT-AX82U Firmware version 3.0.0.4.388_25103
Version 3.0.0.4.388_25103
98.23 MB
2026/11/03
SHA-256 :C8AAB3EC762A986267D2056330992FA04247268EFF558EAC074167025A5DBFEE

Fixed an issue that could cause DNS resolution failures and loss of Internet access when DNSSEC is enabled.

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 the Speedtest Service Announcement for details:
https://www.asus.com/support/faq/1057454/

Supports third-party 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.
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-AX82U Firmware version 3.0.0.4.388_25101
Version 3.0.0.4.388_25101
98.19 MB
2026/01/15
SHA-256 :00E344C92BE2ECEB43E3BBD3820C652B11C99F572ADFE4BF5CB18C16DF2AA916

- Fixed abnormal LED behavior.
- Fixed minor GUI bugs.

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ASUS RT-AX82U Firmware version 3.0.0.4.388_25098
Version 3.0.0.4.388_25098
98.2 MB
2025/10/28
SHA-256 :7C67075E8A9FD17A414CB1DAB2F2440452F993463F65F2405EA64D3695DB1CA5

- 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-AX82U Firmware version 3.0.0.4.388_25035
Version 3.0.0.4.388_25035
98.23 MB
2025/05/14
SHA-256 :AD84A80C502EC02FAA0443AF1790731417AB3B98948756254C3D363668621D2C

Improved compatibility with certain IoT devices.

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ASUS RT-AX82U Firmware version 3.0.0.4.388_25029
Version 3.0.0.4.388_25029
98.22 MB
2025/02/25
SHA-256 :0A7590E8C4E0F293728A4A08E8DA923551AF2B114301766BFE3A453B87E57DF4

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-AX82U Firmware version 3.0.0.4.388_25024
Version 3.0.0.4.388_25024
98.27 MB
2025/02/11
SHA-256 :D9AF5B88BC2557485FF531A627B9EEE2F0296C9CA3A93C5F00F38FB8C94BB0C3

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

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ASUS RT-AX82U Firmware version 3.0.0.4.388_25017
Version 3.0.0.4.388_25017
98.27 MB
2024/11/18

Please unzip the firmware file, and then verify the checksum.
SHA256: 18ecb24ce88b32230949b711cc169993ca70b9d1e6c00ae87d4d59a0f1b28069

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.

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ASUS RT-AX82U Firmware version 3.0.0.4.388_25004
Version 3.0.0.4.388_25004
98.39 MB
2024/10/09

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
SHA: 2f664213e3d006825118f5f7dcac5399bc40e85e13f3afd0ad67980f27574308

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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.
  • Brand and product names mentioned are trademarks of their respective companies.
  • 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 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.
    • ASUS makes no representations or warranties about this product’s compatibility with future standards.
    • 6GHz band is limited to indoor range. Clients must support 6GHz band.
    • MU-MIMO capability requires both router and client device to support MU-MIMO.
    • 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.