Restore Windows after failed update on a Bitlocker encrypted machine

I have a Windows 10 laptop which has failed to install a recent Windows update. So on boot it attempts to recover the previous version of Windows, there is a momentary appearance of a command line window and then the laptop reboots. This cycle goes on indefinitely. A complicating factor is that the HDD is Bitlocker encrypted. Can anyone suggest how to recover this laptop.
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socrossAsked:
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McKnifeCommented:
What do you have to restore from? Do you have an image backup? I guess you don't. So you will have to reinstall windows after backing up the data of the current drive. You can mount the drive anywhere you like if you have the recovery key or password (if a password for bitlocker was set). If you don't want to relocate the drive, let me know and I'll tell you how to proceed.
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socrossAuthor Commented:
Thanks McKnife. I don't have an image backup. Bitlocker was configured with a USB key, which I have. I'd prefer not to relocate the drive, but could do so if the alternative would take longer.
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McKnifeCommented:
Ok, I'll outline the steps in a compact manner. Please comment on each number to indicate if you can follow:

1 create a bootable USB windows setup and boot it
2 open a command prompt (press shift F10 at the language selection screen)
3 on the command prompt, use manage-bde to load the bitlocker key from usb to mount your encrypted drive
4 connect an external drive that has http://vault32.com/a56/ a56 file manager on it and use a56 to backup your data
5 reinstall windows
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CompProbSolvCommented:
Do you see the same results if you try to roll back the version by booting from a bootable USB windows setup?
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socrossAuthor Commented:
CompProbSolv, no difference.

McKnife, I understand the your steps, but I find that a56 file manager does not seem to actually copy files across, so I am using Robocopy at command line levelinstead, so far so good. Will report back in due course.......
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McKnifeCommented:
"a56 file manager does not seem to actually copy files" - ha! Used a43 (the previous product) and it did, but you are right - it doesn't! Nice bug for a file manager...
Please note that a43 (if you still needed it once) is 32 Bit, so it would need WinPE x86, a 32 bit setup disk, for example.
http://vault32.com/a43/
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joinaunionCommented:
Do you get a sign in screen? Or does this happen before the sign in screen?
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socrossAuthor Commented:
No sign in screen, joinaunion, just continual initial boot, attempt to recover previous build, fail, re-boot. But well on the way to recovery with help from McKnife.
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joinaunionCommented:
Power cycle the unit 3 times(hard power reset). So power it up then hold power button to shut it off 3 times.

This should bring up automatic repair option. Then you can select advanced options.
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socrossAuthor Commented:
OK, so all is now resolved. None of the Startup Repair or System Restore or Advanced options worked, so I had to do a re-install of W10, after taking a backup of all user data, using Robocopy. (I did not try  a43, and maybe a56 will be debugged soon).

Then it was a case of downloading Windows 10 via Media Creator and creating a bootable USB stick, reinstalling W10 onto the same partition as the corrupted version and then restoring the user files from the backup. W10 updated itself and is now upto date on the machine in question.

Incidentally, installing Windows 10 onto the same partition as before, creates a folder called "windows.old" which includes all the data and program files from before the re-installation, including all the user files...so there was actually no need to have created the backup, I simply had to copy user files from "windows.old" to the new installation.

As far as Bitlocker encryption was concerned, that was no problem, as long as the USB Bitlocker key remained plugged in.

Thanks for help and advice.
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McKnifeCommented:
"installing Windows 10 onto the same partition as before, creates a folder called "windows.old" which includes all the data and program files from before the re-installation, including all the user files...so there was actually no need to have created the backup" - correct, but having no backup at all is never good when leaving windows to modify the installation, that's why "better safe than..." applies
"As far as Bitlocker encryption was concerned, that was no problem" - when backing up data from the command line of setup (boot setup, press shift F10), the key will not be picked up from the usb stick automatically. If we choose repair options - chosse which OS to repair - ... then setup and its repair process will indeed recognize bitlocker encrypted drives and use the key if present, that's true.

Good that it has worked out.
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CompProbSolvCommented:
Just a second to McKnife's comments about installing over existing Windows.  You are both correct that such an installation SHOULD preserve all of your data, but it's not the sort of thing I ever trust.  I usually make a full image backup of a drive (and do a quick confirmation that it copied) before a reinstallation or any other drastic repair methods.
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