PPSSPP problem !

[cruix]

I downloaded the android version of PPSSPP and install it, then I save a couple of games in the folder root of SDcard/PSP/GAME/ and then launch the PPSSPP app ... navigate to load my game and here is where my problem starts. No matter which game I select, it will not load and crash the app going back to phone homescreen. Can someone help me ?
much appreciated for any help I could get

version 0.8.1
all game files are .iso and .cso
my phone is galaxy s4 LTE i9505