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Hold P2.12 low during reset to force DFU mode even if application firmware is present.

Pinouts for the SD card are at

A basic instruction on using dfu-util:

LED pins are set as outputs and toggled during bootloader:

Some other pins are set output/low ( ) due to this bootloader being predominantly designed for Smoothieboard.

If the bootloader finds a file named "firmware.bin" on the FAT32-formatted SD card's first partition, it will flash it to the application region (0x4000, +16k - see ), and after successful flashing, rename the file to "firmware.cur" - 'cur' meaning 'current'.