Windows 10 0xc00021a boot error, i had tried almost everything... Its possible to repair Win10 without losing system settings?

[ruthan]

Hi,
im struggling for quite a long time with 0xc00021a Windows 10 boot error.

I have tried a lot of things, sfc - is fine, dism is fine. Error description is for lots of source of this error.. I have tried to enable ntbtlog.txt, but it seems that its happening before log is create, so i dont have any clues to fix it.
It seems to new bug.
  It happened after some update, i might get out of space during updating, because of app generated 30 GB error file.  I had some restore points, but during restoring i got error, maybe because of now enough space and after restore point data disappered and my last full backup is quite old.

  I have tried manaul BCDedit fixing, all boot fixing utilities which i found - Paragon, EasyUS, Aomie, Dual boot repait, VisualBCD, Bootice, Lazesoft. Bootsec, Hasleo Easy UEFI, including deleting and rebuild EFI partition.
  I haved tried all boot modes - enable logging, safe mode, recovery, autorepair - there is error hardisk not found..

   What is more interesting, i even managed to replicate error on Windows 10 togo on USB-NVME driver, on different hardware.. Its probably again cause by some recent update, or by some BCD change, because some tools are updating try to fix, all connected BCD by mistake... and im unable to fix it even on USB-NVME install on other computer.

  Hardware is ok for sure, because its happening on multiple devices, liveCD are booting fine. Im quite sure that is not because some virus.

  Only thing which im able to ""fix" it is restore whole NVME-USB installation EFI + System partition, restore EFI partition alone is not enough its somehow connected.
  I googled alot, but found only generic tutorials for classic - sfc/dism / bcd fixing.. Disabling some addional disk or disconning devices is not helping too.  I did not found success stories, just people who git complete reinstall or machine reset.

Its possible somehow repair WIndows 10 without losing system settings - installed programs, registry settings and normal files?
I saw some /auto setup.exe settings, but when i tried setup.exe /auto othre commands, i always get unknow option /auto error.