@Granty Try to unplug it and plug it back to the wall socket. And then hold the reset hole for 1s to reset it. After that, please verify whether you can see the default extender wifi. And you can...

@Dilan Hello, what is the led status of RE305 when it fails to connect to the 5GHz? Try to log into the web UI and show us a screenshot of the status page. What is the model number of the main router...

@Marco.Giordano Hi Marco, sorry to respond late. It took us some time to release a firmware aiming to solve this issue. Considering you have returned it, you can get a new extender to boost the wifi...

@EnriqueNavarro What is the led status of the TL-WA850RE? Please show us a screenshot of the status page. Please click the extender's icon and take the full snapshot. Besides, what is the model...

@Alastair432 What is the led status of RE200 now? Try to log into the web UI and show us some screenshots, including the Status page and the settings-network page. Besides, what is the model number...

@Chrisisa Thanks for your information. The latest firmware has resolved this issue, you can upgrade the firmware to give it a go. https://www.tp-link.com/support/download/re305/#Firmware Good day.