Thanks, I managed to solve it by changing the SSID of the range extender. As soon as I did this and added the login/password in the problematic android device, it connected to the network succesfully...

Region : Spain Model : TL-WA850RE Hardware Version : V1 Firmware Version : 3.14.8 Build 130622 Rel.81738n ISP : Jazztel I have installed the TP-Link as a range extender and most of my devices (PCs...