My Windows 10 Version 20H2 will not install the update 0x80004005.

I feel your pain. You are absolutely correct. We spend ~ 20% of our time using this now broken-down software; and ~ 80% of our time fixing issues created by Microsoft. I would be humiliated if I created a product and when my customers had problems, I basically could not, or would not fix them. A problem here or there that is fixed in a timely manner is understandable; but these issues are ignored and some literally go on for years. And reloading Windows is NOT a fix! It is simple a way out that costs MS nothing; but the users are expected to commit extensive time out of their lives to start all over. Also, this is usually the "fix" for issues with Office 365.

I feel that Microsoft started this User Forum so they could avoid their responsibly to fix issues in a timely manner.

1. They create the software,
2. Theyscrewup the updates,
3. Then they expect us to fix the problems they created
4. There are so many folks on here that think they know what they are doing; and most of their supposed solutions either don't work or often make things worse.

You are absolutely correct.

We spend ~ 20% of our time using this now broken-down software; and ~ 80% of our time fixing issues created by Microsoft. I would be humiliated if I created a product and when my customers had problems, I basically could not, or would not fix them. A problem here or there that is fixed in a timely manner is understandable; but these issues are ignored and some literally go on for years. And reloading Windows is NOT a fix! It is simple a way out that costs MS nothing; but the users are expected to commit extensive time out of their lives to start all over.

Also, this is usually the "fix" for issues with Office 365.

Turning off windows backup fixed it for me.

Thank you.  I’ll continuing working this approach. Reinstalling my apps would be very difficult since id have to find many many product activation codes.  

I will certainly update results. 

thank you.

Hello,

In the last suggestion....

My solution is to remove the BCD and build a new one instead of repairing it. Boot into recovery and then command prompt. Use DiskPart to select the EFI volume (the 100MB hidden partition), assign it a drive letter like "v". Go to the EFI volume and directory v:\EFI\Microsoft\Boot\ , and rename the "BCD" file to something else. Run "bcdboot c:\Windows /s v:" to recreate the BCD file (your system drive may vary). Make sure the "\EFI\Microsoft\Boot\BCD" is there and reboot the PC. Try Windows update again

Where should I look for the EFI volume in my configuration?   I used a bootable USB installation to attempted the repair but did not try the command line approach.

Here's what I have configuration wise....  Repair Log Files