Tried to install iGO Primo on a Sony Xperia Z4 Tablet with Android 6.0 Marshmallow on it. First I tried to install it on the external SD card. The installation was successful but iGO did not retain the initial settings. Then I tried to install the program on the internal memory under the root directory and get the same results. Tried to solve the problem as proposed on this site and other sites by splitting the program between the internal memory and the external SD card with adequate update of the sys.txt file which resulted in a non working at all installation. Finally, I moved the whole program under the Android folder in the internal memory and now the program runs flawlessly.