# CR-10 S5 with BTT SKR E3 mini v3.0: - BLtouch v3.1 (conneted to the Z endstop pin) - Stock LCD (connected to the LCD's EXT3 spare port, with one single straight ribbon cable) - Bondtech or stock extruder - Bowden setup - All 4 fans are PWM controlled. ## Flashing Mainboard Firmware The bootloader which handles flashing new firmware on this board remembers the last filename you used. ### Where to put the firmware file on the SDCard: Put the `firmware.bin` file into the root folder.