@Hedgehogglr Hi, what is the model no. , hardware version and firmware version of your extender? Please try move the extender closer to your router and set it up again, then let us know the LED...

@AlexGonza Hi, please connect a computer to the extender via Ethernet cable to see if wired connection has the same issue. If wired connection is the same, please check if there is any change on the...

@Subash007 Hi, you mean all LEDs keeps blinking? please share with us the device S/N which is on the bottom label of the extender itself. Then you could contact the retailer or the local supoort team...

@Lavy Hi, have you ever tried to set up the extender? If not, please refer to the instructions below to configure it: Via Tether App: https://www.tp-link.com/support/faq/1373/ Via Web interface:...

@martin41 Hi, XN020-G3v is a model for ISPs only and we community don't have its firmware information, it is recommended to contact your ISP for help

@kjonca By "after reboot device presents ATTRS{serial}=="0123456789ABCDEF" instead of real one.", do you mean the device MAC address? Please share with us a screenshot if convenient. To assist you...