While seeing "The parameter is incorrect" can be alarming, DISM Error 87 is usually a simple matter of formatting permissions
DISM /Online /Cleanup-Image /RestoreHealth /Source:E:\sources\install.wim dism error 87 fixed
DISM /Mount-Image /ImageFile:"D:\My ISO\install.wim" /Index:1 While seeing "The parameter is incorrect" can be
If DISM binary mismatch suspected:
He took a deep breath, channeling his years of experience. "Okay, Mark. Think. Don't panic. You're in WinRE. You aren't running this from a running desktop. You're running it from the recovery partition." channeling his years of experience. "Okay