To flash a bootloader:
name the file et8000-cfe.bin and place it in a et8000 folder.
Add a 'splash.bin' if you wish.
Create an 'imageversion' file, with a suitable name in it.
Now when the box indicates it found something on the usb stick, press the CH 'down' key (instead of the 'up' key which you would normally use to flash an image).
This procedure is identical to bootloader for et10000/et9x00/et6x00/et5x00/et4x00