@Paul,
my recommendation for the Samsung Galaxy S4 Mini (International LTE) - “serranoltexx” GT-I9195
Go back to StockROM KitKat Android 4.4.2 and install TWRP Recovery and then via TWRP > “Format data” (max. “clean install”). Now install cleanly /e/ OS ROM for /e/ for serranoltexx dev (nougat).