Hi Guys,
I have a CAS 3, I had similar problems trying to program my MREV, problem related to power via usb ports or hubs, ie. maybe a lack off. After writing to the cam I would get usb errors and couldn't verify the file, so, instead of using my USB Hub, I connected the CAS 3 directly to the pc's usb ports. This solved my error messages, allowed the CAS 3 to see the cam without usb errors, and verification of the updated file. Also worked with my MM. Problem only occured with the new updated CAS 3 software, previous version didn't give USB errors.
Eyeonman!