Can it be done from a Debian Live USB?
Is there a method for rescue booting the mangoES
I can't say I've ever tried. I looked at the Odroid forums and the opinion seems to be that you can - kind of. Page 4 of this issue of the Odroid Magazine seems to have the information you're looking for: https://magazine.odroid.com/wp-content/uploads/ODROID-Magazine-201403.pdf
Thanks, again, for the assistance Phil. I found that article and had been putting off trying that method. I will get on it right away. Have you had any success with using a netboot feature set. I may try to install one once I get it bootable again.