@Scuba_Diver 

Hi, I'm a user from the UK.
 

I've checked my Deco M5 system, and all units are currently running on firmware version 1.9.0 (build 20250722 Rel. 56822). I'm not sure how my system was updated to this version, but it appears to have jumped from the 1.8.5 build.
 

I tested the guest Wi-Fi late last night and can confirm that the issue persists. The main and IoT networks are working fine, but devices connected to the guest Wi-Fi have no internet access.
 

Regarding the beta firmware, I don't intend to install it on my system. As a consumer, I believe this level of beta testing should be handled internally by TP-Link, not passed on to customers. This situation further highlights a significant lack of quality control in your firmware release process.
 

While I am glad to see that this issue is being addressed, it's clear that this problem should not have made it to a public release in the first place.
 

  @David-TP 

Any reason why the beta firmware is not incorporated into the 1.9.0 firmware? 

Is there a 1.9.0 beta firmware that incorporates the guest network fix? 

Do you know if the 1.9.0 firmware has a dhcp fix? 

Thanks!