Do add extra spaces, e.g., /Cleanup-Image not /Cleanup -Image .
He typed the command with sweaty fingers: DISM /Online /Cleanup-Image /RestoreHealth dism error 87 fixed
DISM Error 87 can be frustrating, but it can be resolved by following the methods outlined in this article. By running DISM with administrative privileges, checking and fixing corrupted system files, checking for conflicting software or services, updating Windows and DISM, and running SFC and DISM in Safe Mode, you should be able to fix the error and continue using the DISM tool without issues. If the error persists, you may need to seek further assistance from Microsoft support or a professional technician. Do add extra spaces, e
Error: 87 – The option is unknown. For more information, refer to the help by running DISM.exe /?. If the error persists, you may need to