McAfee Corrupted EFI Partition

The Problem

We just migrated from McAfee Endpoint Encryption to Bitlocker at work, and a few of our devices had the following error popup and failed to boot:

Failed to deactivate [0xEE00000C] Failed to remove EPE bootloader, 0xEE00000C   Unexpected exception in EpeUefiBootcode.cpp: [0xEE12000F] Failed to find EE Partition.

What we discovered is that McAfee corrupted the EFI partition. So we booted in to WinPE to fix the issue.

The Fix

NOTE: Before running any of these, confirm what DISK and PARTITION your EFI partition is on.

1. Boot to WinPE
2. Type the Following:
   1. diskpart
      1. select disk 0
      2. select partition 1
      3. delete partition override
      4. create partition efi
      5. format quick fs=fat32 label="System"
      6. assign letter=S
      7. exit
   2. bcdboot C:\Windows
   3. exit

The device should now boot to Windows and you can continue encrypting with Bitlocker! We created a batch file that pulls these commands from a .txt file that we run off of a thumb drive in WinPE. We titled the Batch File and the Text File “Fix-McAfeeEFI” and you can find their contents below.

Batch File

diskpart /s %~dp0Fix-McAfeeEFI.txt

bcdboot C:\Windows

Text File

select disk 0
select partition 1
delete partition override
create partition efi
format quick fs=fat32 label="System"
assign letter=S