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"Unable to repair the UEFI bootloader" message appears when using the Full Disk Encryption (FDE) Recovery Tool

    • Updated:
    • 10 Sep 2019
    • Product/Version:
    • Endpoint Encryption 6.0
    • Platform:
    • Windows 2012 R2
    • Windows 2016
Summary

When trying to use the FDE Recovery Tool to fix a device boot problem, the following error message is seen:

Failed to repair UEFI bootloader

Unable to repair the UEFI bootloader. Contact Trend Micro Support for Assistance.

Details
Public

To resolve this error, the EFI partition needs to be fixed. Follow the steps below:

 
Create a backup disk before attempting to fix the EFI partition.
  1. Mount the EFI partition using the command below:

    mountvol b: /s

     
    Make sure that the mounted partition is the correct one. When the disk is connected to a different machine, you may need to use diskpart to mount the EFI partition.

    If the mountvol command does not work, use the diskpart command. Below is an example:

    diskpart 
    list disk
    select disk # Note: select the target disk
    list partition
    select partition # Note: Select the EFI System partition.
    assign letter=b
    list volume
    exit

    Dispart - File System

     
    The File System (Fs) may display RAW if the partition became corrupted.
  2. Use chkdsk to fix the partition. Follow these steps:
    1. Make sure that chkdsk still detects the file system of the partition:

      Check Disk

    2. Fix the partition using the command below:
      Chkdsk /F b:
    3. Unmount the partition by using this command:
      mountvol b: /d

      If the mountvol command does not work, use the diskpart command. Below is an example:

      diskpart 
      remove letter=b
      list volume
      exit
Premium
Internal
Rating:
Category:
Troubleshoot
Solution Id:
1123734
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