Ok it s a lot clearer / complete explanation for total noobs .
Thank you for taking time to answers .
i am using sd image 2.6 rpi2 for pi2 .
so if i got it good :
run :
cd
cd RetroPie-Setup
sudo ./retropie_setup.sh
<Update Script>
<Reboot> (
then update pocketnes with ” binariy installation ” selected first ?
In any case thank you Very Much .
I ll keep updating this thread .. it might be usefull for others .