Apk /storage/sdcard0/Garmin works on Galaxy S4 GT-I9505 Android ver 5.0.1 (not rooted). Garmin folder has to be placed in phone memory. Not in extSdCard. As mentioned in other posts, SP is sensitive to the .img file put in the Map folder. Initially I couldn't get it to work because I was using .img files that are about two years old. Either crash or map not detected. But finally got it to work after downloading a current version of an .img file. Lastly the apk /storage/extSdCard/Garmin does not work (with Garmin folder in external SD card).