Removing Duplicate Windows Boot Manager Entries in your MDT Task Sequence

We recently purchased quite a few Dell XPS 13 9365 laptops and while testing our image; I noticed that the list of Windows Boot Manager entries in the BIOS was growing each time I would image the laptop. In order to get around this, I had to create the following script that would automatically scan through the Boot Configuration Data (BCD) store and remove all of the duplicate GUID’s that appear after running the image.

# CONFIGURE MDT LOGGING
$TSenv = New-Object -COMObject Microsoft.SMS.TSEnvironment 
$LogPath = $TSenv.Value("LogPath")  
$LogFile = "$LogPath\WindowsBootManagerRemoval.log"

Start-Transcript $LogFile

# LOCATE GUID
$Identifiers = BCDEDIT /ENUM FIRMWARE | Select-String "identifier" | ForEach-Object { $_ -replace "identifier" }

If($Identifiers -ne $Null) {
    
    $IdentifierList = $Identifiers.Replace(" ","") | Where-Object {$_ -notcontains "{fwbootmgr}" -and $_ -notcontains "{bootmgr}"}
    
    Write-Host "" 
    Write-Host "--------------------------------------------------------------------------------" 
    Write-Host "PREPARING TO REMOVE DUPLICATE WINDOWS BOOT MANAGER ENTRIES"
    Write-Host "--------------------------------------------------------------------------------" 
    Write-Host "" 

    # REMOVE GUIDS
    ForEach($Identifier in $IdentifierList) {
        BCDEDIT /Delete $Identifier
        Write-Host "DELETED $Identifier"
    }
}
Else {
    Write-Host "SKIPPING - COULD NOT LOCATE DUPLICATE WINDOWS BOOT MANAGER ENTRIES"
}

Once you are ready to use the script, go ahead and copy it over to your Deployment Share and add it to your State Restore group in your MDT Task Sequence.

Since this was not happening to all of our computer models, I made sure to add a Task Sequence condition that forced this step to only run for the Dell XPS 13 9365 laptops.

Feel free to leave any questions below!