The user can press the ‘Up’ and ‘Down’ buttons to select a specific file or folder. If the ‘Accept’ button is pressed when a folder is selected, the MicroSD Bootloader will display on the OLED the content of that specific folder. To return one level up, the user can either press the ‘Cancel’ button, or can use the ‘Accept’ button when the ‘..’ folder is selected. If the ‘Accept’ button is pressed when a HEX file is selected, the MicroSD Bootloader will prompt the user for a confirmation to load the file from the MicroSD memory card and to program it to the microcontroller’s Flash memory. After this operation is finished, the user may choose to execute that application or to remain in the bootloader. If the ‘Cancel’ button is pressed in the root directory, the MicroSD Bootloader will exit, and the last programmed application will be executed.