Feature update to Windows 10, version 1709 fails to install

It's one at a time, & hit "Enter" after each. You've done "BCDEdit" before. You know that goes on a line by itself & to hit "Enter" after typing it.

"DIR  C:\BU  /a" will list the contents of the BU folder on C:. I want you to see "BCD_Backup" in there.  "/a" says to list the files no matter what the file attributes are - hidden, system, etc.

If you get no listing, then try:  "DIR  D:\BU  /a". That D:drive of yours is a bug-a-boo in more ways than one. It may switch letters with the C:drive when in the Recovery Environment. We need to know. The command to recover your BCD (if necessary) may be either of these...

BCDEdit  /Import  C:\BU\BCD_Backup

    ===== OR =====

BCDEdit  /Import  D:\BU\BCD_Backup

And you would hit Enter after it. Note: That's the new BCD backup - the one with the underline in its name. That way, you don't need to type quotes around it.

I was told long ago by a venerable MVP (but I can't recall his name) that Windows doesn't like a clone to be attached at the same time as the drive it was cloned from. That could be the real root of the problem the computer has with doing the upgrade. It could be confusing the issue of BCD formation. Windows needs to adjust the BCD during the upgrade. We might have trouble regenerating it too.

Why do you have both attached? As I said before, really, the D:drive should be wiped. And system image backups should be put there instead.

Thanks for the feedback

I am surprised by this statement

**"**I was told long ago by a venerable MVP (but I can't recall his name) that Windows doesn't like a clone to be attached at the same time as the drive it was cloned from. That could be the real root of the problem the computer has with doing the upgrade"    ....

perhaps Paragon software in a way could be at fault.  anyway im also thinking of removing the HDD and try the upgrade. Il look for a pc shop first and ask for it to be removed temporarily. would that work? if not, il try your other method.

Yes, at the time, I was upgrading from Win 8.1 to the first Win 10. Not only did I make two system images first onto external media with two different apps, but I also made a clone out of extreme caution. Then, I thought, why not have both Win 8.1 & Win 10 attached? He not only said it was doubtfully legal - but that it wouldn't work. I can see now he might have been thinking of the BCD.

Anyway, yes, by all means, have a shop detach the parent of the clone. On second thought, don't wipe it until you know the clone on the SSD is really working.

OK. Good luck, & keep us informed.

Edit: It's possible that BCD is bad enough that it still will prevent an upgrade even with the HDD detached now. Have the shop do both: detach the HDD first, & then regenerate the BCD. After that, try the upgrade.

1. remove HDD and kaspersky
2. tried w10 ISO 1709 Clean install
3. failed. same msg 

0xC1900101 - 0x20017 Installation failed during safe OS phase with an error during boot operation

i didnt read ur EDIT portion after that.

0xC1900101 - 0x20017 Installation failed during safe OS phase with an error during boot operation

We could check if your setupact.log has changed at all.  E.g. it might be something else now.