Is this related to Zeroshell? How?
If your cousing runs ZS on his router, why would he not just backup profile, reimage the router from a fresh download and restore profile to erase any possible virus?
Yes he uses ZS that’s why I put it here brother.
It was due to the virus and malware present in his other system. PSN was blocking his access. He’s not banned now. He is using it, he just had to run a scan and detect that virus.