For SSH access, you can patch your FW with Advanced Mode, than execute sshd script from /mtd_rwarea/SamyGO.sh, that will solve your problem

You needed to Enable Telnet once to make/test changes. You can use Telnet Enabler Application or use ExLink Cable if you have CI device.
Because In advanced mode, I don't make enable Telnet automatically, but only executing non-existent file.
Thanks