hi, @Papa-Tractor you can refer to the following solutions: 1.When a SD card is inserted into the machine, it is necessary to click "Init. SD-Card" in the last column of the screen, then the machine can read it. if the SD card cannot be read normally, please replace the new one to see whether the card reading is normal or not. 2.Check out whether the card slot loose or not 3.The card slot is oxidized or damaged. The oxidation can be wiped with alcohol. The SD card chip is repeatedly inserted into the card slot, and then try again after cleaning slot with alcohol. If it doesn't work, the card slot may be damaged and a new card slot needs to be replaced. 4.Formatted memory card