How to Configure Telnet in Mikrotik Router - YouTube
hackerfantastic.x on X: "Here is "@mikrotik_com RouterOS <= 6.43.7 post-authentication local root arbitrary file creation #0day." On versions prior to 6.40 this can be used to trivially jailbreak a RouterOS device -
Manual:Entering a RouterOS License key - MikroTik Wiki
How to disable & block SSH access to a MikroTik Router - jcutrer.com