as you all know the new gionee p2s is a just released phone date 03-06-2014, hence only few knows much about how to gain root access into the phone
I tried soon many apps but they all failed to root it properly .
I will recommend two apps that can do the job well. 1 is key root master. 2 is z4root just search for all this on Google and download any and run them on your phone.....
after rooting download root checker to see if its been properly rooted
next download mobileuncle tool; forget terminal emulator it won't help and run it on your phone . then follow the steep in this site
http://forum.gsmhosting.com/vbb/f781/change-imei-mtk-smartphone-without-pc-1721114/