@madhatter13 TP-LINK (EN) website support firmware globally for all the regions included (US) so if your Deco is EU or US you can download the firmware from (EN) website and install it without any...

@DukeCaboom Have u changed the Deco unit from Satellite to Main? Or have u changed the adapter? Are you using Extension Cord to give power to Deco Unit? If yes kindly remove Extension Cord and...

@DukeCaboom Maybe your Deco is faulty. Are u facing connection drop on WiFi or LAN Cable?

@wmosquini Yeah you can install 1.6.5 by using Recovery Mode and i think you can do factory reset and do the setup again on 1.8.1 firmware or you can try AP Mode.

@LadyP You can use Deco E4 with ISP Modem/Router by using ethernet cable and use Deco E4 in AP Mode.

@bringstars What's your Deco M5 hardware version?