What is the correct way to prep an image before uploading it to the imaging server? We have an issue where we thought we prepped an image correctly, but when we restore it to devices they will NOT register with the Zenworks zone.

We took these steps to prep the image:
1.) Delete all image-safe data in ziswin.
2.) Uncheck the box for "Just Imaged".
3.) Delete files 'DeviceData' and 'DeviceGUID' from the /conf/ directory.
4.) Reboot and upload image.

What are we missing?