Login to router via http://192.168.0.1 or http://192.168.1.1

1. For L7 Networks brand

username: operator
password: h566UniFi

2. For dlink brand

username: admin
password: <no password>

Some other to try if the 2 above failed (username/password)

1. tmadmin/<no password>
2. admin/telekom
3. operator/telekom
4. Management/TestingR2

Did the above mentioned username and pass work for you? Please take few sec to reply in the comment area. Thanks.