Update broke computer, unable to roll back

Today, I updated my computer. The update made me unable to login.

I know how I am supposed to be able to roll back the update: Boot into recovery mode, then select uninstall update. However, it asks for my Microsoft Account password to do that. When I provide the password, it tells me it's incorrect. I was pretty sure I had the right password, but I changed it anyway on another computer so I could be absolutely sure. When I copy that new password exactly into the field on the uninstall update page, it still tells me the password is wrong. Since it's "wrong," I can't uninstall the update.

TL;DR, Is there a way to roll back an update without a Microsoft Account password? Or is there a way to make Windows recognize that the password I used is correct?

Thanks for replying. I don't think I have any restore points. I'm not sure what kind of update it was that caused the problem, either, though I'm inclined to believe it was the latest feature update.

I'd like to try the first option you suggest, but I don't have a Windows 10 Home Disc to do that from. How would I go about getting a recovery disc to do that?

Okay, thanks. I was able to get into the section to roll back the update. It let me uninstall the last "quality" update, but I still had the same issue. It won't let me roll back the feature update, which I guess is what caused the problem. It doesn't give me an error code or anything; it just tells me to reset the computer instead.

I don't want to reset the computer and lose my data. Besides, since it was working fine before the update, I know the update caused the issue and whole reset of everything else seems excessive. Is there another way to remove the feature update? Thanks.

You updated your computer.
--- The result was all of a sudden the Microsoft account password wasn’t recognized.
--- What kind of update isn't known.
--- You are inclined to believe it was the latest feature update.

Questions
Why were you updating (Windows Updates) today Monday June 8, 2020?
--- Tomorrow Tuesday June 9, 2020 is Patch Tuesday.
--- What Windows 10 version were you updating from?
--- Has the computer been keeping up with the monthly Windows Updates?

You wanted to roll back. You already know how to do that: however, you need to enter your Microsoft account password. Since your Microsoft account password wasn’t recognized, the computer cannot roll back.
--- Using dalchina’s recommendation How to Remove Updates from Windows Recovery Environment (WinRE) • Repair Windows™ in post #2 is great especially since a password isn’t needed.
--- You were able to uninstall the last quality update but it didn’t solve your issue.
--- You were told to reset the computer. You don’t want to do that because you don’t want to lose your data.
--- You asked “Is there another way to remove the feature update?”
--- I know you are “inclined to believe it was the latest feature update.” But that isn’t known yet.

Re-visit Go Back to the Previous Version of Windows in Windows 10
--- I know you said you already know how to do that but since you did not have a Win 10 bootable disk at that time you were probably working within Windows.
--- Now that you have a Win 10 bootable disk try it from there. I know, it shouldn’t matter but try it from there using the procedures as described in Option One: Go back to Previous Windows from Windows 10 in Advanced Startup options.

"I was pretty sure I had the right password, but I changed it anyway on another computer so I could be absolutely sure."
--- Before you changed the password on another computer, did the originally known password work on that computer before you changed it?

You don’t think you have any restore points.
--- Go back and use that Win 10 bootable disk, get into Advanced Options and find the option to use a restore point. That’s where you will find out if there are any restore points.

You want to know

“Is there a way to roll back an update without a Microsoft Account password?”
--- I doubt it. The correct password is needed.
--- You have another computer on which you changed the Microsoft Account password worked for you.
--- That changed password did not work on your PC in question.
--- I’m not sure because I haven’t had to through that procedure, but if you cannot log-in on the PC in question, linking that same Microsoft account isn’t possible yet.

Or is there a way to make Windows recognize that the password I used is correct?
--- I believe that’s a more difficult question to answer.

dalchina said:

- that sounds like you tried to 'Go back to the previous build' - is that correct?

Yeah, there was two options for uninstalling an update: "uninstall feature update" and "uninstall quality update." It let me uninstall the quality update but not the feature update. It doesn't look exactly the same on my computer as it does on the tutorial you posted below--I guess because it's a different version or I'm accessing the menu a different way or something.

dalchina said:

Normally I'd say see please see:
Go Back to the Previous Version of Windows in Windows 10


However, note that that does require a password....

If you did that, how far did you actually get?

When I try to access it that way, it asks for my Microsoft Account password. When I provide it, it says it's invalid and goes no further.

dalchina said:

I suggest you should check your disk before proceeding much further. As you can't log in, you could do that using a live boot disk and boot your PC from that.

Check it how? Use Command Prompt on the recovery disk and use sfc /scannow or something?

MeAndMyComputer said:

You updated your computer.

Questions
Why were you updating (Windows Updates) today Monday June 8, 2020?
--- Tomorrow Tuesday June 9, 2020 is Patch Tuesday.
--- What Windows 10 version were you updating from?
--- Has the computer been keeping up with the monthly Windows Updates?

I'm not sure what version of Windows 10 the computer has on it (this is actually my brother's PC, but for simplicty in explaining the problem I just treated it like it's mine). The same glitch has been caused by updates a couple times in the past, so he tends to put off updates as long as it lets him, hoping the glitch will be worked out by the time it gets to him. He wasn't lucky this time.

MeAndMyComputer said:

--- Now that you have a Win 10 bootable disk try it from there. I know, it shouldn’t matter but try it from there using the procedures as described in Option One: Go back to Previous Windows from Windows 10 in Advanced Startup options.

I guess I'll try this when I get a chance.

MeAndMyComputer said:

"I was pretty sure I had the right password, but I changed it anyway on another computer so I could be absolutely sure."
--- Before you changed the password on another computer, did the originally known password work on that computer before you changed it?

Yes. In fact, the computer still accepts that password at the lock screen (before the glitch kicks in and brings me back to the lock screen). It just doesn't accept it at that prompt.

MeAndMyComputer said:

You don’t think you have any restore points.
--- Go back and use that Win 10 bootable disk, get into Advanced Options and find the option to use a restore point. That’s where you will find out if there are any restore points.

Even if I do have a restore point, I'd still probably lose at least a few days of data. I'd rather a restore be a last resort.

Finish checking what you can.

If unsuccessful take a look at
Enable or Disable Elevated Administrator account in Windows 10
Option five is good for when you are unable to sign in to Windows 10.
I've only used twice but it did work when I them