I tried all the default ones i think the password is the random letters that comes at the back of each router (every router got a different one) I may try to look up the back of couple of routers to find if it got a same pattern or not if it does can it be bruteforced someway ? Also if i managed to get in is there a way to secure the network that even if the password got changed i can access it again ?
If you get in, go and find out what the wps pin is, put that into a note pad, then make sure the wps is on. Then if the password changes you can still connect using the pin. For brute forcing try : https://github.com/vanhauser-thc/thc-hydra https://0fajarpurnama0.github.io/pentest/2020/04/04/simple-bruteforce-demo-hydra or https://github.com/jmk-foofus/medusa http://foofus.net/goons/jmk/medusa/medusa.html