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Update Boot Image with CU Article 2

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Frank Rojas 2023-07-14 18:02:18 -04:00
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windows/deployment/update-boot-image.md
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# Update Windows PE boot image with the latest cumulative update
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This walkthrough describes how to update a Windows PE (WinPE) boot image with the latest cumulative update.
## Prerequisites
- [Windows Assessment and Deployment Kit (ADK)](https://docs.microsoft.com/windows-hardware/get-started/adk-install). Recommended to use the latest version of the ADK.
- [Windows Assessment and Deployment Kit (ADK)](/windows-hardware/get-started/adk-install). Recommended to use the latest version of the ADK.
## Overview
Note about boot.wim from installation media
## Steps
1. Download and install ADK
2. Download cumulative update (CU)
3. Backup existing boot image (e.g. winpe.wim or boot.wim)
4. Mount boot image to temporary mount folder
5. Add optional components to boot image
6. Add cumulative update (CU) to boot image
7. Copy boot files from mounted image to ADK installation location
8. Perform component cleanup
9. Unmount boot image and save changes
10. Export boot image to reduce size
## Step 1: Download and install ADK
## Step 2: Download CU
## Step 3: Backup existing boot image
## Step 4: Mount boot image to temporary mount folder
## Step 5: Add optional components to boot image
## Step 6: Add cumulative update (CU) to boot image
## Step 7: Copy boot files from mounted image to ADK installation location
## Step 8: Perform component cleanup
## Step 9: Unmount boot image and save changes
## Step 10: Export boot image to reduce size
## Script outline
This PowerShell script appears to be a patching script for the Windows Assessment and Deployment Kit (ADK) and the Windows Preinstallation Environment (WinPE). Here's a breakdown of what the script does:
1. It begins with some comments explaining the purpose of the script and providing links to relevant documentation.
2. The script defines various variables such as `$SMSProvider2012R2`, `$MountFolder`, `$downloads`, and several `$CUDownloadUrl` variables. These variables specify download URLs for cumulative updates (CUs) and other files.
3. The script includes functions like `Test-RegistryValue` and `Get-RegistryValue` for checking and retrieving registry values.
4. It checks if the ADK is installed on the system by checking the registry key `HKLM:\SOFTWARE\WOW6432Node\Microsoft\Windows Kits\Installed Roots`. If the ADK is detected, it retrieves the installation location from the registry.
5. The script verifies the existence of the WinPE image file (`winpe.wim`) and extracts the version information from it.
6. Depending on the WinPE version, the script selects the appropriate CU download URL and sets the `$SSURequired` flag if a Servicing Stack Update (SSU) is needed.
7. It checks if certain folders exist and creates them if necessary (`$downloads`, `$downloads\SSU`, and `$MountFolder`).
8. If the CU file does not already exist in the specified download folder, it uses `Start-BitsTransfer` to download it from the provided URL.
9. If an SSU is required, it performs a similar download process for the SSU file.
10. The script creates a backup of the existing `winpe.wim` file by copying it to `winpe.bak`. If a previous backup already exists, it renames it with the current date appended.
11. It mounts the `winpe.wim` file using `Mount-WindowsImage` to a temporary mount folder (`$MountFolder`).
12. If an SSU is required, it adds the SSU package to the mounted image using `Add-WindowsPackage`.
13. It then iterates through a list of optional components (`$OptionalComponents`) and adds the corresponding packages to the mounted image using `Add-WindowsPackage`. It also checks for language-specific versions of the components and adds them if available.
14. The script adds the downloaded CU package to the mounted image using `Add-WindowsPackage`.
15. It copies updated boot manager files (`bootmgr.efi` and `bootmgfw.efi`) from the mounted image back to the ADK installation location.
16. It performs a component cleanup operation on the mounted image using `dism.exe` to reduce the image size.
17. The script exports the list of installed packages in the modified image to a text file.
18. Finally, it dismounts the image with the modifications, saves the changes, and exports the modified `winpe.wim` file as a new file with reduced file size. It also creates a backup of the original `winpe.wim` file and cleans up temporary files.
The script appears to be designed to update and patch the WinPE image in the ADK installation based on the installed ADK version and the provided CU and SSU files.