KB21110700 Upgrade Windows 10 naar Windows 11 (revised)

According to Microsoft, both firmware TPM (fTPM) and UEFI BIOS are required for Windows 11. You can manually enable these settings in BIOS or just update BIOS to the version that supports Windows 11.

Due to the UEFI requirement of Windows 11, operating system that is installed in CSM mode previously, will not be bootable right away with Windows 11 compatible BIOS default settings, until you do the following changes

Is your rig compatible with the Windows 11 requirements?

Get this file on https://github.com/rcmaehl/WhyNotWin11

Sample output

★★★Before BIOS Update★★★

Perform check the partition style and convert boot device from MBR (CSM compatible style) to GPT (UEFI compatible style) without losing any data
Note: Still backup important data before conversion

# How to check the partition style of my boot device?
1. Run Command Prompt as administrator
2. Use following command: diskpart and then list disk
3. If there is no * in the GPT column, it indicates the disk is MBR partition style

# How to convert boot device from MBR to GPT without losing data on the disk?
Run MBR2GPT in Windows OS (version 1703 or later) with Command 2/3 Prompt

Disk prerequisite

1. Run Command Prompt as administrator
2. Input two commands in this order:

> mbr2gpt /validate /disk:0 /allowFullOS
> mbr2gpt /convert /disk:0 /allowFullOS

* Disk 0 as boot device

3. Reboot System to BIOS and proceed to Windows 11 Compatible BIOS update 4.
New BIOS will enable fTPM and UEFI mode by default.
Now you can boot to OS and upgrade to Windows 11

Source: Ref. MBR2GPT – Windows Deployment | Microsoft Docs


Use MBR2GPT.EXE to convert a disk from the Master Boot Record (MBR) to the GUID Partition Table (GPT) partition style without modifying or deleting data on the disk.

Best safe payware solution by AOMEI



For a error free conversion from Windows-10 into Windows-11 you need:

Verify before you go!
– a MOBO that can handle a Boot mode selection from [LEGACY+UEFI] ->UEFI

– a MOBO with TPM2.0 device selection
-a MOBO that can enable Secure Boot Support

Secure Boot Support will only become active AFTER a conversion from the Disk Partition Type MBR into GPT.

How to Download a Windows 11 ISO File and Do a Clean Install | Tom’s Hardware (tomshardware.com)

How to Download a Windows 11 ISO File and Do a Clean Install | Tom’s Hardware
(Image credit: Tom’s Hardware) The ISO file will now download to your computer. Creating a Windows 11 ISO with UUP Dump. In the early days of Windows 11 testing, Microsoft did not provide an …