I had some problems with my EWF manager on the 400fp-3, I'm not sure if the OS is the same. But if you go into the cmd prompt and enter ewfmgr alone what does it say?
Also, do you have a SIM or another type of computer unit?
Im not an expert, but if you're re-imaging the entire OS system it sounds like it could possibly be a hardware issue or your OS image is faulty.
Not much help I know, but hopefully some of this additional information may help the experts figure out your issue.