We have the same issue with some of the HP ELITEBOOK laptops.
error code: Unexpected exception in EpeuefiBootcode.cpp: [0xEE020001]
Let's start here:
1. McAfee Drive Encryption Version?
2. OPAL or EFI or MBR?
3. When did it start ?
4. Was it only seen on one device or multiple devices?
5. Can you reproduce this symptom?
6. You look at the Logs?
7. Have you used the EZDE Advisor to view logs if your not sure where they are?
Just trying to get information beyond "this is the symptom". Your added information could really help me narrow down where I think the problem is. I have also posed this to DE engineers in support.
I will have the tech obtain the information that I am unable to obtain and will post it back here.......