Windows 11 25H2 - Cannot mount with DISM?

Дата публикации: 07-07-2026 14:34:43

I'm just trying to prep our Windows 11 image for deployment over the summer holidays, but for some unknown reason, I can't get DISM to mount the install.wim from the 25H2 ISO for editing - has anyone else had trouble with this?



I'm getting error 5 Access Denied, which it very much is not. This is with a fresh ISO downloaded from Microsoft, both the June 2026 and September 2025 ISOs are doing the same thing. I can load my 24H2 install.wim fine, so it seems to only be the 25H2 version that's the trouble.



I did wonder if it was the secure boot certificate thing, but, the PC trying to load it is up to date with the 2023 certs, so I'd think not.



I know editing the wim is out of fashion now, but there are a few bits that I do prefer done in the image. Any ideas or advice gratefully received!

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