Hello,
For accessing the Command Line Interface (CLI), kindly note that the login credentials are ‘root’ for “username” and your WebUI password for “password”, as described in the article provided above. Additionally, I highly recommend referring to our wiki for more comprehensive insights into functionalities or configurations.
Regarding updates without “Keep settings”, you have the option to download a backup file of the router from the WebUI. Simply navigate to System → Maintenance → Backup → Backup Configuration. Following the update, you can restore the configuration in the Backup → Restore Configuration.
Let me know how it goes!
Best Regards,