@DavidAA Before Deco mesh, you must have had ISP modem to which HP printer was connected wirelessly. Do you still have that ISP modem in your home network and have you made any changes in its...

@Kuokhong Please also review the following forum topic to see if it applies to your situation: https://community.tp-link.com/en/home/forum/topic/655034

@Sterryr29 When Deco can use Ethernet for backhaul, it will report Ethernet connection in Deco app, here is an example: This is suggested reading: General questions about Ethernet Backhaul feature on...

@dbjunction Force Samsung Tab S10 Ultra tablet to run on 5GHz network. You should be able to do that in Deco app settings, see How to select a preferred signal source on the Deco App Follow Part 2 of...

@DavidAA If your HP printer has Ethernet port, try connecting it to Main or to Satellite Deco with Ethernet cable.

@dpant It is because Deco behaves as a router, with its own IP address range. Configure Deco to run in Access Point mode and it will provide IP addresses from ISP modem/router range. See Switching a...