First thing first, get your box booting into an image. Either "USB flash" an old Vix image you may have or download ATV 6.4 and "USB flash" that.
Once you have a working image, transfer your zipped image the locations listed below. Original locations posted below:
(There have been changes to make locations more universal without removing previous ones, but lets start with the old ones first)
OpenPLI
/media/hdd/downloaded_images
/media/usb/downloaded_images
or root of hdd
Team Blue
/media/hdd/downloaded_images
/media/usb/downloaded_images
OpenATV
/media/hdd/images
OpenViX
/media/hdd/imagebackups
The storage device can also be a USB stick
Images use different names for the process. But in essence they are using ofgwrite.
Flash Image, Flash Online, Flash on the fly, Image Manager. Use the method relevant to your active image to flash the image and it should work.
Vix:
Blue > Vix > Image Manager
ATV:
Blue > Flash Local/online image
OpenPLI:
Menu > Setup > Flash Image
If still does not work, unzip/extract image to the USB drive or HDD
Stop Enigma2 by issuing "init 4" command using Putty or similar.
Issue the following command, adjust the path so it points to where your image is.
ofgwrite -r -k /folder_of_unzipped_image