@Alvin56 Hi, How long have you had the TL-WA855RE? Did it help if you plug the TL-WA855RE next to the Host router? Since TL-WA855RE supports 2.4GHz only, it is also suggested to change the wireless...

@alwin910 Hi, may I know the model number of your range extender? Do you mean that you can't detect the default wireless network of the extender? If yes, please put your phone next to the Extender,...

@Maikelis Hi, welcome to the community. Please refer to the following suggestions: RE220/RE200/RE190 Keeps Restarting Automatically Best regards.

@Lebzs Hi, did the RE and signal LED still light up? Have you tried to reset it and connect to the host router again? It is also suggested to refer to this link: Has connected to TP-Link extender but...

@Odgers02 Hi, welcome to the community. Do you use any powerline adapters from TP-Link? Or could you please refer to the product label to locate the model number first, like RExxx, or TL-WAxxx? Have...

@PanosMyt Hi, welcome to the community. If we left behind the errors on the Deco APP, did both Deco and mobile devices function properly? Could you please share some screenshots of the error message...