Trouble flashing a new Beagle board

I recently bought a BeagleBone Green model to replace one with a bad network card. It’s meant to be connected to a KiwiSDR radio receiver.
(see http://www.kiwisdr.com). I’ve downloaded the Kiwi software image on to an SD card, but whenever I boot the board (either powered by USB or connected to the radio board) the SD card flashing never finishes. It just stays blinking on and off.

Actually, I’d like to copy the whole image from the BeagleBone that had the network issue to the new one, as it has all of my configuration as well as the software, but failing that, is there another way to copy the data directly to the board?