How to Flash Android 9 Pie on Samsung Galaxy A50s SM-A507GN. It will help you how to flash ROM, It works for Galaxy A50s variants SM-A507F, SM-A507FN, SM-A507GN, SM-A507FM, SM-A507YN, SM-A507W , the flashing procedure is still same with other A Series 2018/2019. If you get error message “SECURE CHECK