Error code 0x80070003 - 0x40008 while trying to upgrade Windows 10 to Windows 11

Question

Hello,
I tried to upgrade my windows 10 to Windows 11 using Windows11InstallationAssistant.exe and got the following error code: 0x80070003 - 0x40008.
I saw the similar question already asked here, but I'm not sure my case is the same. Here is my disks images:

and here is the result of setuplogscollect.bat: SetupLogs.zip

Answer 1

Ok, as I already tried many ways to solve my problem, I decided to give a chance to the following recipe I found at reddit, and it works (in cmd admin mode):
diskpart
select disk 0
select part 1
set id=c12a7328-f81f-11d2-ba4b-00a0c93ec93b override
gpt attributes=0x8000000000000000
exit
I wonder why the Windows itself cannot find and fix this system partition id and attribute or at least say that it should be fixed to proceed with updates ?

Answer 2

Please delete the System Reserved partition (E:)

Then, create a EFI partition in the unallocated space.

From Command Prompt admin, run:

bcdedit

diskpart

select volume E

del part override

create partition EFI

format fs=fat32 quick

assign letter=Y

list vol

exit

Post the screenshot so that I can post the remaining commands.

Answer 3

Hello cawa, welcome to Microsoft Q&A forum.

Based on the details, your system is likely booting in Legacy BIOS mode with an MBR disk layout. Windows 11 requires your system to boot in UEFI mode and use a GPT disk.

First, try to upgrade via the ISO file. Download the Windows 11 ISO from Microsoft, mount in and run setup.exe — this method is sometimes more reliable than the assistant.

If it fails, follow these steps:

1.Check your current boot mode:

• Press Win + R > run msinfo32
• Look for "BIOS Mode". If BIOS Mode = “Legacy” > wrong. If BIOS Mode = “UEFI” > this is correct (no issue here)

2.Check if your system disk is MBR:

• Open Command Prompt as Administrator
• Type: diskpart list disk exit
• Look at the list of disks. If your system disk (usually Disk 0) has no asterisk (*) under the “GPT” column, it means it’s using MBR > wrong.

3.If you confirm it’s MBR + Legacy BIOS, here’s how to fix it:

a) First, suspend BitLocker or device encryption if it’s enabled (this avoids boot issues later). Also, back up your important files just in case.

b) Convert your disk from MBR to GPT:

• Open Command Prompt as Administrator
• Run: mbr2gpt /validate /allowFullOS mbr2gpt /convert /allowFullOS
• If the commands fails, stop and share the exact error message.

c) Change your firmware settings from Legacy BIOS to UEFI:

• Restart your PC and enter BIOS/UEFI setup (usually by pressing Delete, F2, or Esc right after powering on)
• In BIOS:
  • Find the setting called “Boot Mode” or “CSM” (Compatibility Support Module)
  • Disable CSM or set Boot Mode to “UEFI” (not “Legacy” or “Auto”)
  • Find and enable “Secure Boot” and “TPM 2.0”
• If you’re not sure where these settings are in your BIOS/UEFI, let me know your PC or motherboard model and (if possible) share a screenshot of your BIOS/UEFI screen.

4.Retry the upgrade with the Assistant or ISO

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