Run Boot media without “Press any key to boot from…” message

If it is a traditional PC BIOS then the ISO uses the El Torito boot code ( In this case deleting \boot\bootfix.bin will work.

If it is an EFI BIOS then the ISO should use EFI boot code (efisys.bin).
There is also a efisys_noprompt.bin boot code file that can be used when creating the ISO for EFI systems.
Use that file instead if you want to eliminate the prompt.

Microsoft Technet article:



Download Windows ADK
Install Deployment Tools

Copy original boot media iso to C:\Temp\NoPrompt
Copy oscdimg.exe, efisys_noprompt.bin and to C:\Temp\NoPrompt

Run powershellscript below to generate noprompt boot media


## variables ##
$sworkspace = “C:\Temp\NoPrompt\extractedISO”



$sefisys =”C:\Temp\NoPrompt\efisys_noprompt.bin”
$soscdimg = “C:\Temp\NoPrompt\oscdimg.exe”

## start script ##
# mount the ISO
$mount = mount-diskimage -imagepath $stheiso -passthru

# get the drive letter assigned to the iso.
$drive = ($mount | get-volume).driveletter + ‘:’

# copy the existing iso to the temporary folder.
copy-item $drive $sworkspace -force -recurse

# remove the read-only attribute from the extracted files.
get-childitem $sworkspace -recurse | %{ if (! $_.psiscontainer) { $_.isreadonly = $false } }

# Create a bootable WinPE ISO file (remove the “Press any button key..” message)
Copy-Item -Path $setfsboot -Destination “$sworkspace\boot” –Recurse -Force
Copy-Item -Path $sefisys -Destination “$sworkspace\EFI\Microsoft\Boot” –Recurse -Force

# recompile the files to an ISO
# This is the part from Johan Arwidmark’s WinPE creation script:
$Proc = $null
$Proc = Start-Process -FilePath “$soscdimg” “-o -u2 -udfver102 -bootdata:2#p0,eb$setfsboot#pEF,e,b$sefisys $sworkspace $smynewiso” -PassThru -Wait -NoNewWindow

if($Proc.ExitCode -ne 0)
Throw “Failed to generate ISO with exitcode: $($Proc.ExitCode)”

# remove the extracted content.
remove-item $sworkspace -recurse -force

# dismount the iso.
Dismount-DiskImage -ImagePath “$stheiso”







One response to “Run Boot media without “Press any key to boot from…” message”

  1. Gurri Avatar

    I your Earned very well with the help of Trik. Thanku sir

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