How to fix my network/internet modem and router that’s been compromised by an attacker?

My Norton app on my iPhone 13 keeps informing me every time I join my own private internet router that it’s been compromised and that I should turn my VPN on immediately. But in my isp and router and apps stating everything is stable and running as it should . If someone could llessr help

Start by power cycling your modem and router. If that does not clear things up, reinstalling 360 should fix things. Uninstall your 360 app and restart your device. Then reinstall 360 and test.