Hi Bill.
Being new to this box and setup process, I've been digging around the internet for help. I came across this website
http://www.zgemma.tv/ which allows you to click on the Zgemma box model that you have and then download the original factory image. There's also instructions in pigeon english but very easy to follow. I learned that the rear USB port should be used to flash and whenever BOOT appears on the front display, you should press the front power button until it changes to FLSH.
It might be worth going through this slightly longer process to get a base image and then reflash with Whoosh or something else.