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Solution Network Becomes Unstable on Archer AX12 After Updating Firmware to 1.2.1

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Solution Network Becomes Unstable on Archer AX12 After Updating Firmware to 1.2.1

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SolutionNetwork Becomes Unstable on Archer AX12 After Updating Firmware to 1.2.1
Network Becomes Unstable on Archer AX12 After Updating Firmware to 1.2.1
2025-10-21 02:32:14 - last edited Wednesday
Tags: #Network Connectivity #Firmware Update
Model: Archer AX12  
Hardware Version: V1
Firmware Version: 1.2.1 Build 20250729 Rel. 73566

This Article Applied to: 

Archer AX12(EU)_V1_ 1.2.1 Build 20250729

 

Phenomenon:

Some of our users have reported unstable connectivity after updating their routers Archer AX12(EU)_V1 to 1.2.1. This includes:

1. The WAN is frequently disconnected and usually reconnects automatically after a few minutes.

2. Random disconnections on one of the wireless bands, etc.

 

Our user Zeragon first reported it in this thread.
 

Available Solution:

After testing, our relevant department has identified the cause and quickly provided a beta firmware. Several users have verified this beta firmware to resolve the unexpected behaviors.
Please download and manually update the beta firmware if you experience any of the unexpected behaviors mentioned above.

Model Direct Download Link
Archer AX12(EU)_V1 Archer AX12(EU)_V1_1.2.2 Build 20250904(Beta Firmware) 

 

Note: 

 

If your Archer AX12 experiences other unusual behavior after updating to 1.2.1, please feel free to submit your information here. This includes but is not limited to:

1. Complete network topology;
2. Specific exception details;
3. When the problem started, etc.

 

Thank you for your feedback and cooperation.
 

Welcome to Our Community! Get the latest posts: △New Firmware for Archer GE550/GE650 V1 Introduces AI-QoS, EasyMesh IoT Expansion, and More! △New Firmware Releases for Archer BE805 V1/BE450 V1 to Support VPN Merge, New ECO Mode, and More! More posts, please see: △ Get the Ongoing Pre-release Firmware for Wi-Fi Routers Here— Subscribe for Updates! Urgent problems with your Wi-Fi Router, Range Extender, or DSL Modem? Please reach out via private Messages or @Joesph-TP in your new thread directly. Click △ Or ☆Recommended Solution if the post/answer helps.
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1 Accepted Solution
Re:Network Becomes Unstable on Archer AX12 After Updating Firmware to 1.2.1-Solution
Wednesday - last edited Wednesday

 

Hi All 

@Metroplex  @Skye-Kyou  @silfa @SiddNaik 

 

We are excited to announce the release of the latest firmware (version 1.5.0) for the Archer AX12(EU)_V1!

 

This update fixes the anomaly reported in this post and introduces several new features, including the highly anticipated support for EasyMesh Ethernet Backhaul. Additionally, EasyMesh configuration is now supported in AP mode. We encourage you to try out this firmware and experience the new features!

 

Firmware update instructions:
1. Please detect the new firmware on the Firmware Update page, if the latest firmware is detected, you can proceed with an online update.
2. If you prefer to update the firmware manually, please download it here: Archer AX12(EU)_V1_1.5.0 Build 20260605 (The AX12 (US) can also use this version of the firmware)
3. Refer to the guide to update your router's firmware: How to Update Firmware on TP-Link Wi-Fi Routers

 

We will lock this post, and please create a new thread for your router in latest firmware if you have any furthter questions.

Welcome to Our Community! Get the latest posts: △New Firmware for Archer GE550/GE650 V1 Introduces AI-QoS, EasyMesh IoT Expansion, and More! △New Firmware Releases for Archer BE805 V1/BE450 V1 to Support VPN Merge, New ECO Mode, and More! More posts, please see: △ Get the Ongoing Pre-release Firmware for Wi-Fi Routers Here— Subscribe for Updates! Urgent problems with your Wi-Fi Router, Range Extender, or DSL Modem? Please reach out via private Messages or @Joesph-TP in your new thread directly. Click △ Or ☆Recommended Solution if the post/answer helps.
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Re:Network Becomes Unstable on Archer AX12 After Updating Firmware to 1.2.1
2026-03-25 15:19:08

  @Joseph-TP Please provide firmware which support eassymesh via Ethernet on AX12

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Re:Network Becomes Unstable on Archer AX12 After Updating Firmware to 1.2.1
2026-04-23 18:16:57 - last edited 2026-04-23 20:54:53

  @Joseph-TP 

Hi!

After upgrading to V1_1.2.1 on my AX12 i've experienced a speed drop down to 22 mbps on a 250 mbps broadband. This is observed only on WiFi, both 2.4g and 5g. Ethernet connection seems to be working fine. QoS is off, ipv6 is off, easymesh is off. Using beta 1.2.2 didn't help.

Regards

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Re:Network Becomes Unstable on Archer AX12 After Updating Firmware to 1.2.1
2026-04-27 06:39:20

Hello @silfa ,

Thanks for contacting our community.

 

Would you mind taking a hard reset for the Archer AX12 and reconfigure it?

 

Here are some tips to improve your router's wireless speed:
1) Change WiFi channels: Log into the web interface of the router (http://tplinkwifi.net), go to Advanced > Wireless > Wireless Settings. Try different 5GHz Wi-Fi channels to find the best one for your environment, as interference patterns may have changed.
2) Adjust channel width: For 5GHz wireless devices, set the 5GHz channel width to 80MHz or 40MHz to avoid interference. For 2.4GHz devices, set the 2.4GHz channel width to 20MHz.
3) Disable UPNP and SIP ALG: Go to Advanced > NAT Forwarding > UPNP to disable UPNP, then go to Advanced > Security to disable SIP ALG. These features may affect Wi-Fi performance and speedtest results.
4) Try different speedtest servers: Speedtest by Ookla allows you to select different servers • try other servers as some may provide better results.
5) Verify Parental Controls: Open the Tether app and go to Parental Control to ensure no parental control profiles are configured that might be limiting speeds.
6) Check router placement: Make sure the router is properly placed in an open area instead of inside a cabinet or shelf.

Welcome to Our Community! Get the latest posts: △New Firmware for Archer GE550/GE650 V1 Introduces AI-QoS, EasyMesh IoT Expansion, and More! △New Firmware Releases for Archer BE805 V1/BE450 V1 to Support VPN Merge, New ECO Mode, and More! More posts, please see: △ Get the Ongoing Pre-release Firmware for Wi-Fi Routers Here— Subscribe for Updates! Urgent problems with your Wi-Fi Router, Range Extender, or DSL Modem? Please reach out via private Messages or @Joesph-TP in your new thread directly. Click △ Or ☆Recommended Solution if the post/answer helps.
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Re:Network Becomes Unstable on Archer AX12 After Updating Firmware to 1.2.1
2026-04-27 21:17:56

Hello @Joseph-TP ,

I've tried 1-6 and nothing helped. However I decided to make one more hard reset but this time I didn't upload my backup config. I reconfigured router from scratch and that worked! Router can fully saturate my bandwidth now.

No idea what is wrong with my old config file since I have literally the same settings now. I have made it on 1.2.1 and pushed it in to 1.2.2 beta.

 

Thanks for the help and let me know if you want to inspect the config file.

 

Regards,

Fedor

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Re:Network Becomes Unstable on Archer AX12 After Updating Firmware to 1.2.1
2026-04-28 08:58:15

Hello @silfa ,

 

If everything is currently stable, I recommend that you continue monitoring the situation for a while longer. Please feel free to share any updates at any time.

Welcome to Our Community! Get the latest posts: △New Firmware for Archer GE550/GE650 V1 Introduces AI-QoS, EasyMesh IoT Expansion, and More! △New Firmware Releases for Archer BE805 V1/BE450 V1 to Support VPN Merge, New ECO Mode, and More! More posts, please see: △ Get the Ongoing Pre-release Firmware for Wi-Fi Routers Here— Subscribe for Updates! Urgent problems with your Wi-Fi Router, Range Extender, or DSL Modem? Please reach out via private Messages or @Joesph-TP in your new thread directly. Click △ Or ☆Recommended Solution if the post/answer helps.
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Re:Network Becomes Unstable on Archer AX12 After Updating Firmware to 1.2.1
2026-04-28 10:12:36

  @Joseph-TP 

Are you gonna fix this bufferbloat issue on AX-12? Even QoS didn't help a lot also, The firmware requires optimization as significant bufferbloat issues persist even over a LAN Ethernet connection. A firmware update is needed to address the queue management and stabilize latency under high load.

 

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Re:Network Becomes Unstable on Archer AX12 After Updating Firmware to 1.2.1
2026-04-28 11:21:02

Hi @Skye-Kyou ,

 

We believe that the issue you are experiencing may be strongly linked to your specific usage scenario. As you can see, other users—such as silfa—have found the anomaly to be resolvable after applying version 1.2.2 beta.
We will continue to follow up on your case in your other post; see here.

 

Welcome to Our Community! Get the latest posts: △New Firmware for Archer GE550/GE650 V1 Introduces AI-QoS, EasyMesh IoT Expansion, and More! △New Firmware Releases for Archer BE805 V1/BE450 V1 to Support VPN Merge, New ECO Mode, and More! More posts, please see: △ Get the Ongoing Pre-release Firmware for Wi-Fi Routers Here— Subscribe for Updates! Urgent problems with your Wi-Fi Router, Range Extender, or DSL Modem? Please reach out via private Messages or @Joesph-TP in your new thread directly. Click △ Or ☆Recommended Solution if the post/answer helps.
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Re:Network Becomes Unstable on Archer AX12 After Updating Firmware to 1.2.1
2 weeks ago

  @Joseph-TP  Why i have frequent lag spikes with my ax12 with 1.2.1 firmware with roblox games and warthunder with packet loss 
i tried lowering the mtu and still im having lag spikes usually my router isp gives me around 35-50 ping as with the ax12 35-100

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Re:Network Becomes Unstable on Archer AX12 After Updating Firmware to 1.2.1
2 weeks ago

Hello @Metroplex ,

Welcome to our community.

Please try the beta firmware here: Network Becomes Unstable on Archer AX12 After Updating Firmware to 1.2.1

Welcome to Our Community! Get the latest posts: △New Firmware for Archer GE550/GE650 V1 Introduces AI-QoS, EasyMesh IoT Expansion, and More! △New Firmware Releases for Archer BE805 V1/BE450 V1 to Support VPN Merge, New ECO Mode, and More! More posts, please see: △ Get the Ongoing Pre-release Firmware for Wi-Fi Routers Here— Subscribe for Updates! Urgent problems with your Wi-Fi Router, Range Extender, or DSL Modem? Please reach out via private Messages or @Joesph-TP in your new thread directly. Click △ Or ☆Recommended Solution if the post/answer helps.
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Re:Network Becomes Unstable on Archer AX12 After Updating Firmware to 1.2.1-Solution
Wednesday - last edited Wednesday

 

Hi All 

@Metroplex  @Skye-Kyou  @silfa @SiddNaik 

 

We are excited to announce the release of the latest firmware (version 1.5.0) for the Archer AX12(EU)_V1!

 

This update fixes the anomaly reported in this post and introduces several new features, including the highly anticipated support for EasyMesh Ethernet Backhaul. Additionally, EasyMesh configuration is now supported in AP mode. We encourage you to try out this firmware and experience the new features!

 

Firmware update instructions:
1. Please detect the new firmware on the Firmware Update page, if the latest firmware is detected, you can proceed with an online update.
2. If you prefer to update the firmware manually, please download it here: Archer AX12(EU)_V1_1.5.0 Build 20260605 (The AX12 (US) can also use this version of the firmware)
3. Refer to the guide to update your router's firmware: How to Update Firmware on TP-Link Wi-Fi Routers

 

We will lock this post, and please create a new thread for your router in latest firmware if you have any furthter questions.

Welcome to Our Community! Get the latest posts: △New Firmware for Archer GE550/GE650 V1 Introduces AI-QoS, EasyMesh IoT Expansion, and More! △New Firmware Releases for Archer BE805 V1/BE450 V1 to Support VPN Merge, New ECO Mode, and More! More posts, please see: △ Get the Ongoing Pre-release Firmware for Wi-Fi Routers Here— Subscribe for Updates! Urgent problems with your Wi-Fi Router, Range Extender, or DSL Modem? Please reach out via private Messages or @Joesph-TP in your new thread directly. Click △ Or ☆Recommended Solution if the post/answer helps.
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Helpful: 6

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Network Connectivity Firmware Update