In this comprehensive guide, we will explain what DISM Error 87 means, why it happens, and provide to fix it permanently. What is DISM Error 87? DISM (Deployment Imaging and Service Management) is a built-in command-line tool in Windows 10 and Windows 11. It is used to repair the Windows system image, including the recovery environment and Windows PE.
DISM /Online /Cleanup-Image /RestoreHealth Result: Error: 87 – The option is unknown.
DISM /Online /Cleanup-Image /RestoreHealth dism error 87 fixed
If you are copying commands from a website, paste them into Notepad first and look for auto‑formatted slashes. If you are unsure about a specific DISM switch, let DISM teach you the correct format.
Missing colon after Online .
If you are a Windows user who has ever tried to repair a corrupted system image using the Deployment Imaging and Service Management (DISM) tool, you may have encountered a frustrating roadblock: DISM Error 87 .
Typically displayed in the Command Prompt as Error: 87 – The option is unknown , this error halts your repair efforts immediately. While the message sounds vague, it is actually a very specific syntax error. The good news? It is almost always fixable within minutes. In this comprehensive guide, we will explain what
By carefully reviewing your command, ensuring /Online: has the colon, and running the tool with administrative privileges, you will resolve this error in under two minutes. For the rare cases where the error persists, repairing your system files with SFC or switching to PowerShell will get the job done.