@lapsmith I have Deco M4 (V2) which support Connection Preference for client devices aswell.

@lapsmith Hmmm i think you have to update to the beta firmware 1.7.0 because David-TP said the firmware from July 2025 does'nt support Connection Preference but the beta firmware from September 2025...

@lapsmith This beta firmware is more latest than the firmware which i provided you earlier on your post. This beta is from September 2025 and the firmware i provided you is from July 2025.

@lapsmith You can try that if there is an issue so u can update to the stable one.

@pjs_gsy You can downgrade to this beta firmware which is released in 2025 by using the Recovery Mode. Check the link below. https://community.tp-link.com/en/home/forum/topic/838522

@lapsmith When did you add Deco W2400 in your system? And what is the hardware and firmware version of your Deco W2400 ?