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PSFX2MSU.cmd
PSFX2MSU.cmd
 
 
README.md
README.md
 
 

README.md

PSFX MSU Maker

Info

  • Automated command script to create Windows 11 LCU MSU file out of the UUP update files

Requirements

  • Mandatory : LCU cab and psf files
  • Mandatory : AggregatedMetadata cab file
  • Mandatory : DesktopDeployment cab file or SSU cab file
  • Recommended: DesktopDeployment cab file and SSU cab file
  • Optional : DesktopDeployment_x86.cab file

example:

886fa207-124a-4633-9f08-438f1c614f28.AggregatedMetadata.cab  
DesktopDeployment.cab  
SSU-22000.345-x64.cab  
Windows10.0-KB5007262-x64.cab  
Windows10.0-KB5007262-x64.psf

Usage

  • Make sure the downloaded files are not read-only or blocked

  • Extract this package zip file to a folder with a simple path

  • Copy or move the needed files next to the script, then run PSFX2MSU.cmd

  • Alternatively from command prompt, run the script and provide path to the folder containing the files

example:
PSFX2MSU.cmd E:\Downloads\uup-converter\UUPs

  • The result msu file will be located in the same source folder (current or provided)

example:
Windows10.0-KB5007262-x64.msu

Remarks

  • To install the created msu on live OS, you must use command line tool DISM.exe
    you cannot install it normally by launching the msu itself directly

example:
DISM /Online /Add-Package=E:\Downloads\uup-converter\UUPs\Windows10.0-KB5007262-x64.msu

  • The script do not require administrator privileges
    however, if you get Access Denied errors, run it as administrator

  • DesktopDeployment.cab and DesktopDeployment_x86.cab will be constructed, if not provided

  • If DesktopDeployment_x86.cab is not provided or creation failed, the result msu can be used as follows:

x64 msu: installed on live OS only, or require x64 Host OS to add msu for x64 image

arm64 msu: installed on live OS only, or require arm64 Host OS to add msu for arm64 image

  • The script can create MSU only for one LCU at a time (based on AggregatedMetadata.cab)

  • Advanced: edit the script to change the manual option IncludeSSU or enable debug mode _Debug

Background

  • Windows 11 Latest Cumulative Update (LCU) is available only as a PSFX v2 format

It consist of a cab file that contain the update packages and components manifests,
and a psf file that contain forward-only differentials payload files, which require WinSxS source files

  • The corresponding msu update file also introduce a new combined UUP format

https://techcommunity.microsoft.com/t5/windows-it-pro-blog/windows-11-cumulative-update-improvements-an-overview/ba-p/2842961

  • Installing this MSU with DISM.exe tool can be accomplished in two ways:

Old:
extract the cab/psf files and use PSFExtractor to generate the payload files
the installed update will be missing the reverse differentials

New:
add the msu file directly, even on current running live OS
the installation process will generate the reverse differentials