To summarize ,
I red all your discussions and i wrote manually the command
devel-su
/opt/bin/video-call-installer true
chmod 777 /etc/call-ui
chmod 777 /etc/call-ui/callUIVideoButton
/usr/lib/package-manager/reboot.sh

after the first line command (devel-su) it needed a password ,
I entered "rootme" as a password then I entered the remained commands/line , but,
the last line command not found .
Please tell me if there was a previous steps should proceeds before commands or WHAT ?

To more explaining see plz that screen snapshot at that link :
https://fbcdn-sphotos-h-a.akamaihd.n...66466604_n.jpg