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Compatible with:
Aircraft: P4, P4 Pro, Mavic, Spark, I2
Remote Control: Mavic
Goggles: DJI

DOWNLOAD THE ENTIRE ZIP FILE NOT JUST THE EXE
Make sure Assistant2 is not running
Turn on the aircraft/RC and allow it to fully start up
Plug in USB cable from the aircraft/RC to the PC
Start DUMLdore.exe

LOAD: Will load a firmware file to flash. Some error checking is done to make sure it is valid. It is not perfect and up to the user to make sure it is.
FLASH: Upload the firmware file to the device and begin the upgrade/downgrade.
BACKUP: Will make a flashable firmware backup of the currently connected device if applicable. It will save the dji_system.bin file into the current directory. It may take some time. Please be patient as the status may take a few moments to update on some of the files.

NOTE: Make sure you have atleast 50% battery remaining before you begin
FIRMWARE FILES: https://github.com/MAVProxyUser/dji_system.bin

Thanks to hostile, the_lord, p0v and many others for the information :)

-jezzab