Able to install W11 in Hyper-V Gen 1 machine?


J

jabbado

Well-known member
Local time
5:15 PM
Posts
7
OS
Windows 11, Windows 10
I've recently started using Hyper-V for running test environments after using VMware for years.

The other day I decided to try installing windows 11 on a VM. I created an iso of 21H2 (build 1042) using the uupdump.net site.
Being new to Hyper-V I created a Gen 1 machine. The W11 build installed without a hitch and I was able to create a native boot vhdx from it.

Then yesterday I dowloaded the 22H2 iso from Microsoft and tried the same thing. But it would not install due to the TPM 2 requirements etc.
After reading a few guides it seems all W11 versions need to be installed on a Gen 2 VM.

My simple question is: why can I install from the 21H2 iso to a Gen 1 VM when it should be locked down as well?
 
Windows Build/Version
10.0.22000.1042

My Computer

System One

  • OS
    Windows 11, Windows 10
jabbado said:
I've recently started using Hyper-V for running test environments after using VMware for years.

The other day I decided to try installing windows 11 on a VM. I created an iso of 21H2 (build 1042) using the uupdump.net site.
Being new to Hyper-V I created a Gen 1 machine. The W11 build installed without a hitch and I was able to create a native boot vhdx from it.

Then yesterday I dowloaded the 22H2 iso from Microsoft and tried the same thing. But it would not install due to the TPM 2 requirements etc.
After reading a few guides it seems all W11 versions need to be installed on a Gen 2 VM.

My simple question is: why can I install from the 21H2 iso to a Gen 1 VM when it should be locked down as well?
Click to expand...
Earlier versions were more relaxed. MS have been tightening things up.
 

My Computer

System One

  • OS
    Windows 11 Pro + Win11 Canary VM.
    Computer type
    Laptop
    Manufacturer/Model
    ASUS Zenbook 14
    CPU
    I9 13th gen i9-13900H 2.60 GHZ
    Motherboard
    Yep, Laptop has one.
    Memory
    16 GB soldered
    Graphics Card(s)
    Integrated Intel Iris XE
    Sound Card
    Realtek built in
    Monitor(s) Displays
    laptop OLED screen
    Screen Resolution
    2880x1800 touchscreen
    Hard Drives
    1 TB NVME SSD (only weakness is only one slot)
    PSU
    Internal + 65W thunderbolt USB4 charger
    Case
    Yep, got one
    Cooling
    Stella Artois (UK pint cans - 568 ml) - extra cost.
    Keyboard
    Built in UK keybd
    Mouse
    Bluetooth , wireless dongled, wired
    Internet Speed
    900 mbs (ethernet), wifi 6 typical 350-450 mb/s both up and down
    Browser
    Edge
    Antivirus
    Defender
    Other Info
    TPM 2.0, 2xUSB4 thunderbolt, 1xUsb3 (usb a), 1xUsb-c, hdmi out, 3.5 mm audio out/in combo, ASUS backlit trackpad (inc. switchable number pad)

    Macrium Reflect Home V8
    Office 365 Family (6 users each 1TB onedrive space)
    Hyper-V (a vm runs almost as fast as my older laptop)
cereberus said:
Earlier versions were more relaxed. MS have been tightening things up
Click to expand...
But was this possible only within a Hyper-V machine? Because I'm sure I couldn't get an earlier w11 iso to install in Vmware without enabling UEFI/TPM etc.
 

My Computer

System One

  • OS
    Windows 11, Windows 10
jabbado said:
I dowloaded the 22H2 iso from Microsoft and tried the same thing. But it would not install due to the TPM 2 requirements etc.
After reading a few guides it seems all W11 versions need to be installed on a Gen 2 VM.
Click to expand...
A Gen 1 Hyper-V machine is a Legacy bios/MBR machine, a Gen 2 machine is a UEFI/GPT machine.

It makes no difference whether a machine is virtual or physical, Windows 11 requirements are for a UEFI/GPT machine that supports secure boot, at least 4GB RAM, a supported processor and TPM 2.0.

Likewise, it is perfectly possible with some known workarounds to install Windows 11 on any unsupported Legacy bios/MBR machine. You can install 11 on a Gen 1 machine if you really need to, you'll just need to use the same workarounds as for any other unsupported device.
 

My Computers

System One System Two

  • OS
    Windows 11 Home
    Computer type
    Laptop
    Manufacturer/Model
    Acer Aspire 3 A315-23-R9VY
    CPU
    AMD Athlon Silver 3050U
    Memory
    8GB
    Graphics Card(s)
    Radeon Graphics
    Monitor(s) Displays
    laptop screen
    Screen Resolution
    1366x768 native resolution, up to 2560x1440 with Radeon Virtual Super Resolution
    Hard Drives
    1TB Samsung EVO 870 SSD (from April 2026: 250GB EVO 850)
    Internet Speed
    150 Mbps
    Browser
    Edge, Firefox
    Antivirus
    Defender
    Other Info
    fully 'Windows 11 ready' laptop. Windows 10 C: partition migrated from my old unsupported 'main machine' then upgraded to 11. A test migration ran Insider builds for 2 months. When 11 was released on 5th October 2021 it was re-imaged back to 10 and was offered the upgrade in Windows Update on 20th October. Windows Update offered the 22H2 Feature Update on 20th September 2022. It got the 23H2 Feature Update on 4th November 2023 through Windows Update, 24H2 on 3rd October 2024 through Windows Update by setting the Target Release Version for 24H2, and 25H2 on 30th September 2025 through Windows Update by setting the Target Release Version for 25H2.

    UPDATE - 11 April 2026: due to mechanical deterioration this PC has been retired from active duty. The OS with all software and files has been migrated to my System Seven below to carry on as my general purpose 'main machine'.

    My SYSTEM THREE is a Dell Latitude 5410, i7-10610U, 32GB RAM, 512GB NVMe ssd, supported device running Windows 11 Pro.

    My SYSTEM FOUR is a 2-in-1 convertible Lenovo Yoga 11e 20DA, Celeron N2930, 8GB RAM, 256GB ssd. Unsupported device: currently running Win10 Pro, plus Win11 Pro RTM and Insider Dev, Beta, and RP 24H2 as native boot vhdx.

    My SYSTEM FIVE is a Dell Latitude 3190 2-in-1, Pentium Silver N5030, 8GB RAM, 1TB NVMe ssd, supported device running Windows 11 Pro, plus Insider Beta, Dev, and Canary builds (and a few others) as a native boot .vhdx.

    My SYSTEM SIX is a Dell Latitude 5550, Core Ultra 7 165H, 64GB RAM, 1TB NVMe SSD, supported device, Windows 11 Pro 24H2, Hyper-V host machine. Updated to 25H2 on 30th September 2025.

    My SYSTEM SEVEN is a Lenovo Thinkpad T580, Intel Core i7-8650U, 16GB RAM, 512GB NVMe SSD + 2nd 512GB NVMe SSD, a supported device for Windows 11. This is my current general purpose 'main machine'. The installed Windows 11 Home from my System One has been migrated to this machine.
  • Operating System
    Windows 11 Pro
    Computer type
    Laptop
    Manufacturer/Model
    Dell Latitude E4310
    CPU
    Intel® Core™ i5-520M
    Motherboard
    0T6M8G
    Memory
    8GB
    Graphics card(s)
    (integrated graphics) Intel HD Graphics
    Screen Resolution
    1366x768
    Hard Drives
    500GB Crucial MX500 SSD
    Browser
    Firefox, Edge
    Antivirus
    Defender
    Other Info
    unsupported machine: Legacy bios, MBR, TPM 1.2, upgraded from W10 to W11 using W10/W11 hybrid install media workaround. In-place upgrade to 22H2 using ISO and a workaround. Feature Update to 23H2 by manually installing the Enablement Package. In-place upgrade to 24H2 using hybrid 23H2/24H2 install media. Upgraded to 25H2 by Enablement Package. Also running Insider Dev, and Canary builds and Windows 10 as native boot .vhdx.

    My SYSTEM THREE is a Dell Latitude 5410, i7-10610U, 32GB RAM, 512GB NVMe ssd, supported device running Windows 11 Pro.

    My SYSTEM FOUR is a 2-in-1 convertible Lenovo Yoga 11e 20DA, Celeron N2930, 8GB RAM, 256GB ssd. Unsupported device: currently running Win10 Pro, plus Win11 Pro RTM and Insider Dev, Beta, and RP 24H2 as native boot vhdx.

    My SYSTEM FIVE is a Dell Latitude 3190 2-in-1, Pentium Silver N5030, 8GB RAM, 1TB NVMe ssd, supported device running Windows 11 Pro, plus Insider Beta, Dev, and Canary builds (and a few others) as a native boot .vhdx.

    My SYSTEM SIX is a Dell Latitude 5550, Core Ultra 7 165H, 64GB RAM, 1TB NVMe SSD, supported device, Windows 11 Pro 24H2, Hyper-V host machine. Updated to 25H2 on 30th September 2025.

    My SYSTEM SEVEN is a Lenovo Thinkpad T580, Intel Core i7-8650U, 16GB RAM, 512GB NVMe SSD + 2nd 512GB NVMe SSD, a supported device for Windows 11. This is my current general purpose 'main machine'. The installed Windows 11 Home from my System One has been migrated to this machine.
Bree said:
It makes no difference whether a machine is virtual or physical, Windows 11 requirements are for a UEFI/GPT machine that supports secure boot, at least 4GB RAM, a supported processor and TPM 2.0.
Click to expand...

Then I'm confused. I know about the workarounds and have tried some of the patching methods in VMware.
However this is an unpatched iso of 21H2 created from the uupdump site three days ago. I just installed it again in a new Gen 1 machine:

hyper-v 21H2.png

How is this possible then?
 

My Computer

System One

  • OS
    Windows 11, Windows 10
Copy the following to a text file and the name file whatever you want with a ".REG" extension. I'll just assume "bypass_win11_requiremenets.reg".

Code: 
Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SYSTEM\Setup\LabConfig]
"BypassTPMCheck"=dword:00000001
"BypassSecureBootCheck"=dword:00000001
"BypassRAMCheck"=dword:00000001
"BypassStorageCheck"=dword:00000001
"BypassCPUCheck"=dword:00000001

Drop "bypass_win11_requiremenets.reg" onto the root of you Windows ISO image.

Start installation as usual to HYPER-V as a gen 1 system. As soon as Windows setup pauses at the first static screen, press SHIFT + F10 to open a command prompt.

In the command prompt, navigate to the install disk and run "bypass_win11_requiremenets.reg".

Continue installation as normal. It should install just fine.

Edit: If you don't want to re-create your ISO image with the above file, then simply run the appropriate registry commands below from the command prompt when you get to the first static screen like this:

reg add HKLM\System\Setup\LabConfig /v BypassTPMCheck /t reg_dword /d 0x00000001 /f reg add HKLM\System\Setup\LabConfig /v BypassSecureBootCheck /t reg_dword /d 0x00000001 /f reg add HKLM\System\Setup\LabConfig /v BypassRAMCheck /t reg_dword /d 0x00000001 /f reg add HKLM\System\Setup\LabConfig /v BypassStorageCheck /t reg_dword /d 0x00000001 /f reg add HKLM\System\Setup\LabConfig /v BypassCPUCheck /t reg_dword /d 0x00000001 /f
 
Last edited:

My Computers

System One System Two

  • OS
    Win11 Pro 25H2 (RTM+)
    Computer type
    PC/Desktop
    Manufacturer/Model
    Acemagic
    CPU
    Intel i7-14650HX
    Memory
    32 GB
    Graphics Card(s)
    No GPU - Built-in Intel Graphics
    Sound Card
    Integrated
    Monitor(s) Displays
    Varies as machine will often be moved to locations with different monitors
    Screen Resolution
    Varies
    Hard Drives
    1 x 1TB Gen 4 NVMe SSD
    PSU
    120W Power Brick
    Keyboard
    Corsair K70 Max RGB Magnetic Keyboard
    Mouse
    Logitech MX Master 3
    Internet Speed
    1Gb Up / 1 Gb Down
    Browser
    Edge
    Antivirus
    Windows Defender
  • Operating System
    Win11 Pro 25H2 (RTM+)
    Computer type
    Laptop
    Manufacturer/Model
    Lenovo ThinkBook 13x Gen 2
    CPU
    Intel i7-1255U
    Memory
    16 GB
    Graphics card(s)
    Intel Iris Xe Graphics
    Sound Card
    Realtek® ALC3306-CG codec
    Monitor(s) Displays
    13.3-inch IPS Display
    Screen Resolution
    WQXGA (2560 x 1600)
    Hard Drives
    2 TB 4 x 4 NVMe SSD
    PSU
    USB-C / Thunderbolt 4 Power / Charging
    Keyboard
    Backlit, spill resistant keyboard
    Mouse
    Buttonless Glass Precision Touchpad
    Internet Speed
    1Gb Up / 1Gb Down
    Browser
    Edge
    Antivirus
    Windows Defender
    Other Info
    WiFi 6e / Bluetooth 5.1 / Facial Recognition / Fingerprint Sensor / ToF (Time of Flight) Human Presence Sensor
hsehestedt said:
Copy the following to a text file and the name file whatever you want with a ".REG" extension. I'll just assume "bypass_win11_requiremenets.reg".
............
Click to expand...
No, I'm not asking how to get it to install. I'm saying I can install using this "legit" iso into a gen 1 VM without any patching whatsoever and would like to know why?
 

My Computer

System One

  • OS
    Windows 11, Windows 10
jabbado said:
No, I'm not asking how to get it to install. I'm saying I can install using this "legit" iso into a gen 1 VM without any patching whatsoever and would like to know why?
Click to expand...
Well, I have just tried to install 22H2 in gen 1 and it does not let me.

As I said, MS were more lenient on initial release.
 

My Computer

System One

  • OS
    Windows 11 Pro + Win11 Canary VM.
    Computer type
    Laptop
    Manufacturer/Model
    ASUS Zenbook 14
    CPU
    I9 13th gen i9-13900H 2.60 GHZ
    Motherboard
    Yep, Laptop has one.
    Memory
    16 GB soldered
    Graphics Card(s)
    Integrated Intel Iris XE
    Sound Card
    Realtek built in
    Monitor(s) Displays
    laptop OLED screen
    Screen Resolution
    2880x1800 touchscreen
    Hard Drives
    1 TB NVME SSD (only weakness is only one slot)
    PSU
    Internal + 65W thunderbolt USB4 charger
    Case
    Yep, got one
    Cooling
    Stella Artois (UK pint cans - 568 ml) - extra cost.
    Keyboard
    Built in UK keybd
    Mouse
    Bluetooth , wireless dongled, wired
    Internet Speed
    900 mbs (ethernet), wifi 6 typical 350-450 mb/s both up and down
    Browser
    Edge
    Antivirus
    Defender
    Other Info
    TPM 2.0, 2xUSB4 thunderbolt, 1xUsb3 (usb a), 1xUsb-c, hdmi out, 3.5 mm audio out/in combo, ASUS backlit trackpad (inc. switchable number pad)

    Macrium Reflect Home V8
    Office 365 Family (6 users each 1TB onedrive space)
    Hyper-V (a vm runs almost as fast as my older laptop)
cereberus said:
Well, I have just tried to install 22H2 in gen 1 and it does not let me.
Click to expand...
Yeah. It was pointed out to me on another forum also, that the 21H2 version I downloaded may have been a preview release and some of those will install on non-complient hardware. I don't know how true that is.
 

My Computer

System One

  • OS
    Windows 11, Windows 10
jabbado said:
Yeah. It was pointed out to me on another forum also, that the 21H2 version I downloaded may have been a preview release and some of those will install on non-complient hardware. I don't know how true that is.
Click to expand...
Well, there are only two possible answers

True

or

False

If False, then you could not have installed it. Thus the answer must be true.
 

My Computer

System One

  • OS
    Windows 11 Pro + Win11 Canary VM.
    Computer type
    Laptop
    Manufacturer/Model
    ASUS Zenbook 14
    CPU
    I9 13th gen i9-13900H 2.60 GHZ
    Motherboard
    Yep, Laptop has one.
    Memory
    16 GB soldered
    Graphics Card(s)
    Integrated Intel Iris XE
    Sound Card
    Realtek built in
    Monitor(s) Displays
    laptop OLED screen
    Screen Resolution
    2880x1800 touchscreen
    Hard Drives
    1 TB NVME SSD (only weakness is only one slot)
    PSU
    Internal + 65W thunderbolt USB4 charger
    Case
    Yep, got one
    Cooling
    Stella Artois (UK pint cans - 568 ml) - extra cost.
    Keyboard
    Built in UK keybd
    Mouse
    Bluetooth , wireless dongled, wired
    Internet Speed
    900 mbs (ethernet), wifi 6 typical 350-450 mb/s both up and down
    Browser
    Edge
    Antivirus
    Defender
    Other Info
    TPM 2.0, 2xUSB4 thunderbolt, 1xUsb3 (usb a), 1xUsb-c, hdmi out, 3.5 mm audio out/in combo, ASUS backlit trackpad (inc. switchable number pad)

    Macrium Reflect Home V8
    Office 365 Family (6 users each 1TB onedrive space)
    Hyper-V (a vm runs almost as fast as my older laptop)
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