@AmranS Hi, Could you please clarify the exact model number of your TP-Link extender? (should be printed on a label on the device itself) Normaly, the term "AV600" is more associated with TP-Link's...

@rctp Hi, What is the model name of your router? Whether the lock icon light is off or on or blinking depends on certain things. Are you trying to connect a wireless device via the "WPS" function?

@Fishlove Ok, then make sure you replicate the settings for the Internet connection from the original router to the Archer AX12. Furthermore, in some cases Internet Service Providers will bind the...

@Fishlove Hi, How did you connect to the modem before you bought the Archer AX12 ? If you connect a computer straight to the modem, is that computer able to connect to the Internet right away?

@fatatesz Ok, but are you sure there was an USB 2.0 port amongst them? On most modern motherboads I've seen the USB 2.0 ports are located next to the PS/2 keyboard/mouse port. If the TX20U Plus...

@fatatesz Perhaps there is a small chance your Archer TX20U Plus is indeed defective, but especially if your computer is based on AMD hardware, then replacing it with an identical new one might not...