I looked in Zgemma > hard disk on my pc.......but no folder or file named images in there.
I would start again from scratch as I think your head could be spinning by now.
2 ways to go forwards:
1. If you are running WooshBuild v4.x you can update using the box:
Blue button -> Backup settings - takes seconds to complete
Then from the same menu select flash online / local
Green button -> Highlight WooshBuild Latest -> Green button - This should start downloading WooshBuild v5. Once done press OK and then OK again. This should then start to flash your box
2. Starting from fresh:
Download the right WooshBuild v5 for your box
Format the USB you are going to flash with using your PC
Open the zip file you downloaded and you will see a zgemma folder. Copy this folder directly to your USB. There is no need to make any folders, just drag and drop the zgemma folder from the zip file to your USB stick.
Once the folder has copied across - takes a couple of minutes - you can also copy your line file onto the USB too.
Put the USB stick in the front of the box and turn it on. The LCD on the front should now say FLSH.