I know how to roll back using Windows 10 settings, or from advanced repair options if Windows 10 fails to boot 3 times. That's not the problem. I need to fix several computers (different brands and models) that stopped booting to the desktop after upgrading to v1803... Windows starts booting, and after about 10 seconds restarts, and this goes on a loop. No system restore points (of course), no safe mode, none of the usual fixes work. If I could boot to safe mode I could run "DISM /Online /Initiate-OSUninstall" via an elevated command prompt. The problem is that I can only boot to a command prompt if I use recovery media. And if I use recovery media, DISM says it can't run the /online command while in PE mode.
If there's a way to run the DISM command to run a /Initiate-OSUninstall on an offline image please show me (and us) how. I hope it's not impossible. I tried adjusting the usual DISM that is used to clean up Windows images by specifying the path to the Windows image and replacing the cleanup option with the "Initiate-OSUninstall" option and it didn't work. I hope there's a way to rollback feature upgrades by using recovery media.