@BottleTiger Hi, thanks for posting question here. As @Alexandre. suggested, you may add Deco X55 as satellite Deco, and refer to Case1 in the guide: How to replace the main Deco with another Deco...

@thusband Hi, thanks for posting question here. Not sure what mode you set for the Deco network, you may refer to 4G/5G Backup Mode in the guide to find possible solutions: How to set up Internet...

@phiphi84 Hi, welcome to our community. What is the model number and firmware of your Deco? Did you ever change any settings or physical connections before the problem happened? You may check the...

@Bloortiz Hi, welcome to our community. The wireless signal you found via WiFi Analyzer should be the thing that is used for communicating among your Decos, which can not be connected by any other...

@Rolfj Hi, thanks for posting question here. The two guides below may help you to delete old network and configure new network: How to delete a network on the Deco app How to Create a New Network in...

@Myser Hi, welcome to our community. It suggested to follow Case3 in the guide to troubleshoot: What should I do if the TP-Link network adapter is not working properly in my computer? You may also...