'ext-ms-ntos-ksr-l1-1-1.dll not found in API set array' followed by BSOD 'INACESSIBLE_BOOT_DEVICE'

[aw1cks]

Just tried to get 21H2 booting without much luck. ntfs2btrfs was successful and I can mount the btrfs volume from Linux. I compiled HEAD and added /ONECPU to the boot options which fixed another issue I was seeing. However now I am getting a BSOD with 'INACCESSIBLE_BOOT_DEVICE' and just before this, 'ext-ms-ntos-ksr-l1-1-1.dll not found in API set array'. Some research suggests this module is something to do with kernel soft reboot? Which doesn't seem to be supported by Windows 10.

Let me know if I can test/try anything, happy to provide more info.

[JoniG59]

hi i have almost the same issue. i installed windows 10 21h1 on an NTFS and copied it to an btrfs-subvolume and made the required changes in freeldr.ini after that i tried to boot and got 'ext-ms-ntos-ksr-l1-1-1.dll not found in API set array' and then it got stuck at 'booting Windows...'

does anyone know how to solve it? for me it looks just like a missing dll

[maharmstone]

The DLL message is a red herring, it says that for everyone - it's a weird Microsoft thing.