nefe_lpmk wroteIf he has no connection to your router he cant hack it.
With the right amount of time any password can be hacked specially if he has good coverage from your Wireless.
He can't have access to your router from the internet unless you have a public IP which I doubt it , or you are on an old Cable provider network.
I think he hacked your Wifi password then logged in to your router using default password.
My advice :
Make the router management page accessible by LAN only (so you must be plugged to access )
Make the SSID hidden , and connect to it manually.
Keep checking client list from the router page to make sure no unwanted devices are connected.
Bind the mac address of the devices you want connected manually so only them can connect.
Good luck
Thanks!
I changed the default username an password of my tplink back then but your login by LAN only is even better.
I used to be able to ban ips from device I don't know on my old speedtouch.
Now I want to hack my neighbor router at the mountain as I don't have internet there, that's why I am interested to know if there is a software than can let you access to the router using its default ip address, then default username and password.
In Lebanon we have either tplink,speedtouch or Lynksis