pi@octopi:~/klipper $ make flash FLASH_DEVICE=/dev/serial/by-id/usb-LeafLabs_Maple-if00
  Flashing out/klipper.bin to /dev/serial/by-id/usb-LeafLabs_Maple-if00
Entering bootloader on /dev/serial/by-id/usb-LeafLabs_Maple-if00
Device reconnect on /sys/devices/platform/soc/3f980000.usb/usb1/1-1/1-1.1/1-1.1.2/1-1.1.2:1.0
sudo dfu-util -p 1-1.1.2 -R -a 2 -D out/klipper.bin

dfu-util 0.9

Copyright 2005-2009 Weston Schmidt, Harald Welte and OpenMoko Inc.
Copyright 2010-2016 Tormod Volden and Stefan Schmidt
This program is Free Software and has ABSOLUTELY NO WARRANTY
Please report bugs to http://sourceforge.net/p/dfu-util/tickets/

dfu-util: Invalid DFU suffix signature
dfu-util: A valid DFU suffix will be required in a future dfu-util release!!!
dfu-util: No DFU capable USB device available

Failed to flash to /dev/serial/by-id/usb-LeafLabs_Maple-if00: Error running dfu-util

If the device is already in bootloader mode it can be flashed with the
following command:
  make flash FLASH_DEVICE=1eaf:0003

If attempting to flash via 3.3V serial, then use:
  make serialflash FLASH_DEVICE=/dev/serial/by-id/usb-LeafLabs_Maple-if00

src/stm32/Makefile:58: recipe for target 'flash' failed
make: *** [flash] Error 255