Do one of the following: Insert SD / memory card. Ensure the gold contacts are facing down then press in on the card tray to lock into place. Remove SD / memory card. From the bottom of the card, carefully lift to remove. To assist, use the opening on the opposite side of the tray to dislodge (using a fingernail or similar tool).
Right click on your SD card in My Computer and click on format. Clear Cache Partition of your Samsung Galaxy S7. First of all turn off your Samsung Galaxy S7. Now press and hold Volume up + Home + Power Button Simultaneously. Keep on holding the buttons until you see Android figure in the background. Once in Recovery menu.