Or otherwise modify one of the startup scripts in
/mnt/HD/HD_a2/Nas_Prog/*/start.sh
In order to modify sshd_config on startup
Since the primary use case for ssh login is for git, I suppose its startup script is the best candidate to use to modify the ssh configuration file.
In conclusion - to allow normal user login, modify file
/mnt/HD/HD_a2/Nas_Prog/git/start.sh
and add these two lines at the bottom
sed -ir 's/(AllowUsers .*)/\1 alice bob/' /etc/ssh/sshd_config
kill -HUP `cat /var/run/sshd.pid`
Be sure to replace “alice” and “bob” with actual user names that are already present. Separate each name with a space.
No firmware modification necessary.