Update-OSDeployBootISO

Rebuilds the bootable ISO files for a selected OSDeployCore BootImage build.

Property	Value
Module	OSDeploy
Platform	Windows 11 25H2 build 26200 or later (amd64 / arm64)
Requires	Valid license, Run as Administrator, Windows ADK installed, a completed BootImage build

Description

Regenerates the ISO files (bootmedia.iso and optionally bootmedia_ca2023.iso) for a selected completed BootImage from %ProgramData%\OSDeployCore\boot. The existing bootmedia directory content is used as-is — no DISM mount or WIM modification is performed.

The function:

• Prompts for selection of a completed BootImage build
• Verifies the Windows ADK is installed
• Uses the installed ADK's oscdimg.exe to rebuild the ISO(s)
• Places the resulting ISOs in the BootImage's root directory

Use this function when you need to regenerate an ISO from existing bootmedia files without rebuilding the entire WinPE image. Use Build-OSDeployBoot to perform a full rebuild.

Syntax

Update-OSDeployBootISO [-WhatIf] [-Confirm]

Parameters

The BootImage selection is made with an interactive Out-GridView picker.

Parameter	Type	Required	Description
-WhatIf	Switch	No	Preview ISO creation after selecting a build.
-Confirm	Switch	No	Confirm each ISO creation operation.

Examples

# Prompt for a BootImage build selection and rebuild its ISO files
Update-OSDeployBootISO