Introduction: The Frustration of Error 87 You’re trying to repair your Windows system image using the Deployment Imaging and Service Management (DISM) tool. You type what you think is the correct command, hit Enter, and instead of a progress bar, you see: "Error: 87 – The option is unknown to this version of DISM." Or sometimes: "Error: 87 – The parameter is incorrect." This error brings your repair process to a screeching halt. The good news? DISM error 87 is almost always a syntax mistake or a version mismatch — not a fatal corruption issue. In this guide, you’ll learn exactly how to fix error 87 quickly, plus how to prevent it from coming back. What Is DISM and Why Does Error 87 Occur? DISM (Deployment Imaging and Service Management) is a built-in Windows command-line tool used to prepare, modify, and repair system images, including the Windows Recovery Environment (WinRE) and Windows Setup.
DISM /Online /Cleanup-Image /RestoreHealth /Source:WIM:E:\sources\install.wim:1 /LimitAccess If your source path contains spaces, error 87 may occur because DISM misinterprets the path as multiple parameters. dism error 87 fixed
sfc /scannow Then restart and try DISM again. PowerShell handles paths and parameters differently. Open PowerShell as admin and run: Introduction: The Frustration of Error 87 You’re trying