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.
If a particular switch doesn’t appear in the help list, it doesn’t exist in your version of Windows (e.g., some switches are only for Windows PE). dism error 87 fixed
Attempting to run a Windows 10/11 DISM command on an older OS like Windows 7 without the necessary updates. Typically displayed in the Command Prompt as Error:
He typed diskpart , then list volume . He saw the main partition. It was labeled D: tonight. It is almost always fixable within minutes
A: Yes, Windows Server uses the same DISM tool, so Error 87 occurs under the same conditions—typos and incorrect parameters.
| Incorrect (Triggers Error 87) | Correct (Works) | | --- | --- | | dism /online /cleanupimage /restorehealth | dism /online /cleanup-image /restorehealth | | dism /online /cleanup-image /restore health | dism /online /cleanup-image /restorehealth | | dism /online /cleanup-image /source:WIM:E:\sources\install.wim | dism /online /cleanup-image /source:WIM:E:\sources\install.wim:1 | | dism /image:C:\ /cleanup-image | dism /image:C:\ /cleanup-image /restorehealth |
If the troubleshooter didn't work, you may need to manually reset the services that DISM relies on. Open .
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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.
If a particular switch doesn’t appear in the help list, it doesn’t exist in your version of Windows (e.g., some switches are only for Windows PE).
Attempting to run a Windows 10/11 DISM command on an older OS like Windows 7 without the necessary updates.
He typed diskpart , then list volume . He saw the main partition. It was labeled D: tonight.
A: Yes, Windows Server uses the same DISM tool, so Error 87 occurs under the same conditions—typos and incorrect parameters.
| Incorrect (Triggers Error 87) | Correct (Works) | | --- | --- | | dism /online /cleanupimage /restorehealth | dism /online /cleanup-image /restorehealth | | dism /online /cleanup-image /restore health | dism /online /cleanup-image /restorehealth | | dism /online /cleanup-image /source:WIM:E:\sources\install.wim | dism /online /cleanup-image /source:WIM:E:\sources\install.wim:1 | | dism /image:C:\ /cleanup-image | dism /image:C:\ /cleanup-image /restorehealth |
If the troubleshooter didn't work, you may need to manually reset the services that DISM relies on. Open .