Xfinity routers are very popular and familiar nowadays due to their efficiency. However, users often face various login problems. Here are the steps to fix Xfinity router default password: Open your regular browser to access your Xfinity account. Log in to your account by entering the credentials- Username and password. Go to the Settings option. Select the Internet option. Go to 'Wi-Fi credentials'. Click on the Edit option. Now change the Wi-Fi name (SSID) and password. Click on 'Save' to save the changes you have made to your account. There are other ways to fix Xfinity router default password , like, changing the password through the Xfinity My Account application on Android or iOS.