Release ASUS TUF-AX4200 Firmware version 3.0.0.4.388_33965 (2025/10/23)

[fruitcornbread]

Version 3.0.0.4.388_33965
41.88 MB
2025/10/23

- 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.

ZIP SHA-256 : B4AFCAB4835802411252C05711993D3A1355BB99DE6B8274FEDCE406DDB96A97
FW SHA-256 : 90668bc95d1a5c3130e2c16bc92c3bb551e5c477ce8d3c049daf02bdda73be1f

TUF Gaming AX4200｜WiFi Routers｜ASUS Global

ASUS gaming routers provide the very best gaming experience, with an arsenal of features and tools designed to improve online gaming performance and give you the competitive edge you need to win.

www.asus.com

 

[Unhappy ASUS user]

I would like to point out the persistent problems with loading websites with this firmware 3.0.0.4.388_33965.
Sometimes pages do not load, or load slowly and without images, there is also a problem with rewinding movies, the movies stop and only help to turn off and on the movie, but only until the next rewind scene.
I bought this router on recommendation three weeks ago, since I have had it I am unhappy, the children complain about Discord outages and lag in games. It helped to switch to the older firmware 3.0.0.4.388_33506, but this is not a solution for the potential security risk that the older firmware brings. This is the worst product I have ever purchased.
Before uploading the new firmware, I performed a hard reset from the website and then via the VPS button, I performed the same reset after uploading the new firmware. I always did the settings manually, I did not use the recovery file with the settings.
I have my router set to reboot every night.

 

[Unhappy ASUS user]

Hi, I contacted ASUS support and was told that they are not experiencing any issues with page loading, internal network freezes, or other issues. This means that they are not aware of any issues and there is no plan to fix them.

 

[Unhappy ASUS user]

ASUS support wanted to send the data, so I reinstalled this firmware 3.0.0.4.388_33965, did a complete data reset and then manually set up the router. After a while, the problems started to reappear.
In more than a week since I installed firmware 3.0.0.4.388_33506, I haven't had a single problem.

 

[bingoshrimp]

I'm sorry you are having these problems on your newly-purchased router. As you might have gathered by now, the problems began with the 339xx branch of the firmware, the first of which was released back in March 2025. I have a RT-AX59U, afaik based on the same chipset as the AX4200, and before then, it was as stable as any other product I'd owned, and I would have gladly recommended it as well.

There's no telling how long these problems will persist, unfortunately. They might be gone in the next firmware update, but if what you mention is true - that they're not even aware of any problems - I wouldn't hold my breath. I've sent complaints to ASUS through the router feedback mechanism, also mentioning the MediaTek chipset specifically, so I cannot believe how they are not aware of the issues with the affected routers.

If you're not interested in throwing money at the problem, I believe you do have some options for getting a stable internet connection with the router:
- Use cabled networking only
- Install OpenWRT - from what I've gathered, there are no problems if this custom firmware is installed. And apparently, MediaTek based routers are well supported and sought-after because of this. It does require putting in the time to learn, and from what I can see it's not beginner friendly, which was what put me off from doing it.

Personally I ended up buying an access point and hooking it up to the router, completely replacing the router's built-in wifi, and, as you might have guessed, it solved the problems immediately. However, I was also in a position where I wanted to move on to something more professional grade networking gear, so buying the AP was a really meaningful first step in that direction.

EDIT:
I just discovered a post saying that enabling the Adaptive QoS feature might be a solution to the problem: https://www.snbforums.com/threads/a...-0-0-4-388_33965-2025-10-23.95998/post-974943. Couldn't hurt trying it out, if you haven't already.

 

[Unhappy ASUS user]

@bingoshrimp
Hi, thanks for the feedback, I'm also sorry that you have the same problems as me.
ASUS support actually wrote to me that they don't have any problems described, but it could be a defense mechanism of the company, it's always better to say that there are no problems and the customer is to blame, or they investigated the problem but didn't record the problems.
The worst part is the fact that they released four firmwares and all of them are unusable, while they must have feedback from customers that there are problems, although there are certainly many customers who have the problem, but they can point to the culprit - the ASUS router.
I solved it by installing the latest working firmware, I don't have a public IP address and I'm hidden behind a provider, so I hope the router won't be attacked.
I also read that enabling the Adaptive QoS function could alleviate the problems, but it was also written that enabling the Adaptive QoS function slows down the connection by half.
We have no choice but to wait and see if ASUS fixes these issues in the new firmware.

 

[supermetroid]

I don't know if it's too early but I've updated my router to the latest firmware and so far no issues. All I've done after the firmware was installed was to reboot the router.

How long did it take before issues surfaced ?