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Guide 📘

1. Requirements ✅

  • Know how to access the BIOS settings of the target PC ⚙️
  • Two USB sticks (of at least 16 GB) 💾💾
  • A sheet of paper 📝
  • A pen 🖊️
  • Rufus tool:
    • choco install rufus
    • Rufus
  • Windows installation image:

2. Flash the Windows 11 image to the USB stick 💿➡️💾

  1. Connect the first USB stick to the PC
  2. Open Rufus
  3. Select the correct USB stick
    • 1.png
  4. Select the Windows 11 ISO
    • 2.png
  5. Set the correct BIOS/boot partition format
    • If the target PC uses UEFI, the partition table must be GPT
    • 3.png
  6. Check that the file system is NTFS
    • 4.png
  7. Other options that you can set for the Windows ISO image:
    • 5.png

3. Prepare the target PC 🖥️

  1. Turn off the target PC (if it is on)
  2. Connect both USB sticks 💾💾
  3. Turn on the PC and enter the BIOS ⚙️
  4. Set the first USB stick as the boot device
    • At the end of the guide, it may be necessary to set Windows Boot Manager as the default boot option 🔁

4. Steps inside the Windows installer 🪟

  1. Press Shift + F10 to open Command Prompt (cmd) ⌨️

  2. Type diskpart and press Enter to open the partition tool.

  3. Inside diskpart, type list vol and press Enter to list all storage volumes 💽

  4. Write down the output (for example on the sheet of paper) for the next steps 📝

  5. Exit diskpart by typing exit and pressing Enter.

  6. Now type the following command (all on one line), customizing the values in angle brackets <...>:

    dism /capture-image /imagefile:<drive_letter_of_second_USB>:\install.wim /capturedir:<drive_letter_where_Windows_is_installed>:\ /scratchdir:<same_drive_as_imagefile>:\ /name:<image_name_without_spaces> /compress:maximum /checkintegrity /verify /bootable
    • <drive_letter_of_second_USB> → the drive letter of the second USB stick (use the notes from list vol)
    • <drive_letter_where_Windows_is_installed> → the drive letter where Windows is installed (for example C)
    • <same_drive_as_imagefile> → usually the same as <drive_letter_of_second_USB>
    • <image_name_without_spaces> → the name you want to give to the image (no spaces)

  7. At the end of the process, you can turn off the PC by typing:

    wpeutil shutdown

    and pressing Enter 📴

  8. The system image will be saved on the second USB stick with the name you chose! 🎉💾

5. Prepare the ISO content 📂

  1. Connect both USB sticks to the working PC 💾💻

  2. Create a working directory on the PC (for example: C:\WinISO_Workdir) 📁

  3. Copy all the content from the Windows installer USB stick into the working directory.

  4. In the working directory, go to the sources folder and replace the existing install.wim file with the install.wim from the second USB stick (the one created with dism).

    • Original file path:
      • <working_directory>\sources\install.wim
    • New file path (from second USB):
      • <second_USB_drive_letter>:\install.wim

6. Create the ISO image 💿

  1. Install the Windows ADK (Assessment and Deployment Kit):

  2. Open Deployment and Imaging Tools Environment as Administrator.

  3. Once you are inside the working directory, run the following command (all on one line), replacing the values in <...> with your paths:

    oscdimg.exe -m -o -u2 -udfver102 -bootdata:2#p0,e,b<Source Path>\boot\etfsboot.com#pEF,e,b<Source Path>\efi\microsoft\boot\efisys.bin <Source Path> <Saving path and name of file>

    Where:

    • <Source Path> → the full path of the working directory (for example C:\WinISO_Workdir)
    • <Saving path and name of file> → the full path and file name of the ISO you want to create
      • Example: D:\ISOs\Custom_Windows11.iso

  4. When the command finishes successfully, your custom ISO image will be available at:

    • <Saving path and name of file> 🎉💾

7. Reference 🔗