Solved garlin's PowerShell scripts for updating Secure Boot CA 2023


rtorres said:
Get-Partition: C:\Users\RYSZARD\Desktop\ksas\Check_UEFI-CA2023.ps1:1447
Line |
1447 | $GUID = (Get-Partition -DiskNumber $SystemDisk | Where-Object { $ …
| ~~~~~~~~~~~
| Cannot validate argument on parameter 'DiskNumber'. The argument is null. Provide a valid value for the
| argument, and then try running the command again.
Get-Volume_DevicePath: C:\Users\RYSZARD\Desktop\ksas\Check_UEFI-CA2023.ps1:1449
Line |
1449 | $EFI_Path = '{0}EFI' -f (Get-Volume_DevicePath $GUID)
| ~~~~~
| Cannot bind argument to parameter 'VolumeGUID' because it is an empty string.
Click to expand...

What's the output from this PS command? Do you have zero or multiple drives reported?
Code: 
Get-Disk | Where-Object {$_.IsSystem -eq $true}
 

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I updated SVN to version 8.0.

Regarding SkuSiPolicy.p7b policy, what is the Microsoft source for its update? I used this page to apply the policy on a computer, and the last update to this page is December 17, 2025:

Guidance for blocking rollback of Virtualization-based Security (VBS) related security updates - Microsoft Support

support.microsoft.com support.microsoft.com

"Changes made to this article
Change date Description

December 17, 2025

Updated the commands in Step 2 of the "Deploying a Microsoft-signed revocation policy (SkuSiPolicy.p7b)" section as the commands were not working correctly.

From:

reg add HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Secureboot /v AvailableUpdates /t REG_DWORD /d 0x20 /f

Start-ScheduledTask -TaskName "\Microsoft\Windows\PI\Secure-Boot-Update"

To:

$PolicyBinary = $env:windir+"\System32\SecureBootUpdates\SkuSiPolicy.p7b"
$MountPoint = 's:'
$EFIDestinationFolder = "$MountPoint\EFI\Microsoft\Boot"
mountvol $MountPoint /S
if (-Not (Test-Path $EFIDestinationFolder)) { New-Item -Path $EFIDestinationFolder -Type Directory -Force }
Copy-Item -Path $PolicyBinary -Destination $EFIDestinationFolder -Force
mountvol $MountPoint /D"
 

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itsme1 said:
Regarding SkuSiPolicy.p7b policy, what is the Microsoft source for its update? I used this page to apply the policy on a computer, and the last update to this page is December 17, 2025:
Click to expand...
Starting from April 2025, W10 or W11 Monthly Updates will push changes to C:\Windows\System32\SecureBootUpdates.

This may include new versions of the DBXupdate.bin, DBXUpdateSVN.bin and SkuSiPolicy.p7b files.

Prior to Secure Boot getting more attention, SkuSiPolicy.p7b was updated once a year when a new Windows was released in October. Now, it's refreshed every time a new security fix is added to the boot manager file. There doesn't appear to be explicit messaging from MS when the policy file changes, so we need to periodically compare the reference copy from SecureBootUpdates.

If you don't bother updating your Windows, your SkuSiPolicy.p7b might be woefully out of date. There isn't a single reference page like for Defender which lists the latest policy version number. SkuSiPolicy.p7b is a signed, binary encoded version of a XML policy file. Without a special function to decode the contents, you can't know what version you have unless someone publishes the file size or checksum.

I'm using a shortened Get-CIPolicyParser function from Matthew Graeber to extract the version number.
 

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garlin said:
Starting from April 2025, W10 or W11 Monthly Updates will push changes to C:\Windows\System32\SecureBootUpdates.

This may include new versions of the DBXupdate.bin, DBXUpdateSVN.bin and SkuSiPolicy.p7b files.

Prior to Secure Boot getting more attention, SkuSiPolicy.p7b was updated once a year when a new Windows was released in October. Now, it's refreshed every time a new security fix is added to the boot manager file. There doesn't appear to be explicit messaging from MS when the policy file changes, so we need to periodically compare the reference copy from SecureBootUpdates.

If you don't bother updating your Windows, your SkuSiPolicy.p7b might be woefully out of date. There isn't a single reference page like for Defender which lists the latest policy version number. SkuSiPolicy.p7b is a signed, binary encoded version of a XML policy file. Without a special function to decode the contents, you can't know what version you have unless someone publishes the file size or checksum.

I'm using a shortened Get-CIPolicyParser function from Matthew Graeber to extract the version number.
Click to expand...
OK, thanks, I'll probably use your script to update it.

If I don't use your script and I update Windows, SkuSiPolicy.p7b will be updated, right?
 

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itsme1 said:
If I don't use your script and I update Windows, SkuSiPolicy.p7b will be updated, right?
Click to expand...
This part is unclear. Setting AvailableUpdates = 0x20 will force the Secure Boot update task to refresh SkuSiPolicy.p7b.

Now is that something you're supposed to do, or should Windows do this for you? I get the feeling that it's a future goal to have the Secure Boot task silently take care of this after a recent update. MS has all of the puzzle pieces, but they might not be ready to turn on automatic updates.

For now, it wouldn't hurt to run the check script after Patch Tuesday's just to confirm there wasn't a recent change.
 

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garlin said:
This part is unclear. Setting AvailableUpdates = 0x20 will force the Secure Boot update task to refresh SkuSiPolicy.p7b.

Now is that something you're supposed to do, or should Windows do this for you? I get the feeling that it's a future goal to have the Secure Boot task silently take care of this after a recent update. MS has all of the puzzle pieces, but they might not be ready to turn on automatic updates.

For now, it wouldn't hurt to run the check script after Patch Tuesday's just to confirm there wasn't a recent change.
Click to expand...
Yeah, if Microsoft updates it automatically.

I'll use your script and wait and see if Microsoft updates it automatically later.
 

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garlin said:
I've noticed a problem with the April 2026 version of the files. Run these commands instead of the update script.
Code: 
reg add HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Secureboot /v AvailableUpdates /t REG_DWORD /d 0x200 /f
powershell Start-ScheduledTask -TaskName "\Microsoft\Windows\PI\Secure-Boot-Update"

Wait a few seconds. Then run the check script again.
Click to expand...

Thanks, that worked here.


Screenshot 2026-04-19 130330.webp
 

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I just updated SkuSiPolicy.p7b on a computer using your script, and it worked. Then I checked it with your script.

Before that, I tried twice with reg add HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Secureboot /v AvailableUpdates /t REG_DWORD /d 0x20 /f

Start-ScheduledTask -TaskName "\Microsoft\Windows\PI\Secure-Boot-Update", but it didn't work.
 

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😢😢😢
 

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garlin said:
😢😢😢
Click to expand...
MS should hire you for, let's say 6 months
I think you could help them get it all working as it should be, like you explained in this thread
Then, again, maybe you already work for MS... ? :unsure:

But I think we can all agree, who ever you work for, or are retired, one thing is for sure, your help is greatly appriciated !!!
 

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It's not the end of the world:-)
 

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anchamp65 said:
MS should hire you for, let's say 6 months
I think you could help them get it all working as it should be, like you explained in this thread
Then, again, maybe you already work for MS... ? :unsure:
Click to expand...
MS has enough folks working on different Secure Boot features. High-level coordination and public messaging is my concern.
There isn't a Brandon or Amanda equivalent for Secure Boot evangelism.

Sadly I have way too much insight on how the MS sausage factory software development process works. Let's leave it that.
 

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On my unsupported machines I've been running fine after adding the 2023 certs (see output below.) But I've updated the policy SkuSiPolicy.p7b to 8.0 and now can't boot Macrium media without getting the violation notice that it wants to see v 8 but finds v. 7 on the USB stick. I've tried updating the USB media using Make2023BootableMedia.ps1 and UpdateMyBootFile.ps1 but that hasn't been successful. I've searched the forum for instructions but can't seem to find the correct info to update my USB media, which has been working up til updating the machines for SkuSiPolicy.p7b. I apologize for not being able to find the right instructions here as I'm sure they are here . . . .

PS C:\Program Files\PowerShell\7> powershell -nop -ep bypass -f C:\temp\Check_UEFI-CA2023test.ps1 -Verbose
Windows 11 25H2 (26200.8246)

Secure Boot: ON
Virtualization Based Security: OFF
BitLocker on (C:) OFF

BIOS Firmware
-------------
ASUSTeK COMPUTER INC. K30AD_M31AD_M51AD
Version: 0802
Date: 2015-08-02

Factory Default UEFI PK Cert
----------------------------
(NONE)

UEFI PK Cert
------------
Windows OEM Devices PK

Factory Default UEFI KEK Certs
------------------------------
(NONE)

UEFI KEK Certs
--------------
Microsoft Corporation KEK CA 2011
Microsoft Corporation KEK 2K CA 2023

Factory Default UEFI DB Certs
-----------------------------
(NONE)

UEFI DB Certs
-------------
Microsoft Corporation UEFI CA 2011
Microsoft Windows Production PCA 2011
Microsoft Option ROM UEFI CA 2023
Microsoft UEFI CA 2023
Windows UEFI CA 2023

Factory Default UEFI DBX Certs
------------------------------
(NONE)
EFI_CERT_SHA256_GUID Signatures: 0

UEFI DBX Certs
--------------
Microsoft Windows Production PCA 2011
Windows BootMgr SVN 8.0
EFI_CERT_SHA256_GUID Signatures: 439

EFI Files
---------
Windows Boot Manager [Windows UEFI CA 2023] is ALLOWED.
\\.\HarddiskVolume1\EFI\Microsoft\Boot\bootmgfw.efi
File Version: 28000.322, SVN 8.0

Registry: WindowsUEFICA2023Capable = 2
[Windows UEFI CA 2023] in UEFI DB, and Windows starting from CA 2023 Boot Manager.

SkuSiPolicy.p7b is CURRENT.
\\.\HarddiskVolume1\EFI\Microsoft\Boot\SkuSiPolicy.p7b
Version: 33284.17421.33440.335

STATUS REPORT
-------------
Registry: UEFICA2023Status = Updated

SUCCESS: NO UPDATES ARE REQUIRED.

PS C:\Program Files\PowerShell\7>
 

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starchase said:
I've searched the forum for instructions but can't seem to find the correct info to update my USB media, which has been working up til updating the machines for SkuSiPolicy.p7b. I apologize for not being able to find the right instructions here as I'm sure they are here . . . .
Click to expand...
use updated script from this post #1,304
and run it with "-bootmedia" option.
 

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starchase said:
On my unsupported machines I've been running fine after adding the 2023 certs (see output below.) But I've updated the policy SkuSiPolicy.p7b to 8.0 and now can't boot Macrium media without getting the violation notice that it wants to see v 8 but finds v. 7 on the USB stick. I've tried updating the USB media using Make2023BootableMedia.ps1 and UpdateMyBootFile.ps1 but that hasn't been successful. I've searched the forum for instructions but can't seem to find the correct info to update my USB media, which has been working up til updating the machines for SkuSiPolicy.p7b. I apologize for not being able to find the right instructions here as I'm sure
Click to expand...
Use the update script as mentioned above.

I'll have to add some reminders to the REQUIRED ACTION, for users to update their bootable USB drives. The problem is the boot file only changes after a security hole is closed, so there isn't a timetable of when you should be doing this. You could go months without needing any changes. Once you have updated to CA 2023 and revoked CA 2011, the only expected (or rather unexpected) Secure Boot changes will be for the boot manager.

The certs only need to be switched once, but the boot manager may update many times over the years.

Just remember, if you really need to recover from backups, you can always temporarily disable Secure Boot and fix the problem later.
 

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I ran the script Update_UEFI-CA2023.ps1 -BootMedia from the post mentioned and it reported success. When I tried to boot from the USB stick I got this blue screen:

recovery blue screen.webp

Do I need to delete all the certs to get to Setup Mode and start over?
 

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starchase said:
I ran the script Update_UEFI-CA2023.ps1 -BootMedia from the post mentioned and it reported success. When I tried to boot from the USB stick I got this blue screen:
Click to expand...
I don't know if you used this newer version of the script.
 

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garlin said:
What's the output from this PS command? Do you have zero or multiple drives reported?
Code: 
Get-Disk | Where-Object {$_.IsSystem -eq $true}
Click to expand...
I didn't get any output after running that command:

PS C:\WINDOWS\system32> Get-Disk | Where-Object {$_.IsSystem -eq $true}
PS C:\WINDOWS\system32>


If you are interested, I have attached the ps1 file to this response.
 

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I did use the version linked in post # 1304, but I went ahead and ran the above link which should be the same and got a success report
PS Bootmedia.webp
but when booting from the Macrium free USB recovery stick the same blue screen resulted. I ran just now both Check_UEFI-CA2023.ps1 and Check_UEFI-CA2023Test.ps1 to see what version of the SkuSiPolicy.p7b is reported. See below.


PS C:\Users\theislands> powershell -nop -ep bypass -f C:\temp\Check_UEFI-CA2023.ps1 -verbose
Windows 11 25H2 (26200.8246)

Secure Boot: ON
Virtualization Based Security: OFF
BitLocker on (C:) OFF

BIOS Firmware
-------------
ASUSTeK COMPUTER INC. K30AD_M31AD_M51AD
Version: 0802
Date: 2015-08-02

Factory Default UEFI PK Cert
----------------------------
(NONE)

UEFI PK Cert
------------
Windows OEM Devices PK

Factory Default UEFI KEK Certs
------------------------------
(NONE)

UEFI KEK Certs
--------------
Microsoft Corporation KEK CA 2011
Microsoft Corporation KEK 2K CA 2023

Factory Default UEFI DB Certs
-----------------------------
(NONE)

UEFI DB Certs
-------------
Microsoft Corporation UEFI CA 2011
Microsoft Windows Production PCA 2011
Microsoft Option ROM UEFI CA 2023
Microsoft UEFI CA 2023
Windows UEFI CA 2023

Factory Default UEFI DBX Certs
------------------------------
(NONE)
EFI_CERT_SHA256_GUID Signatures: 0

UEFI DBX Certs
--------------
Microsoft Windows Production PCA 2011
Windows BootMgr SVN 8.0
EFI_CERT_SHA256_GUID Signatures: 439

EFI Files
---------
Windows Boot Manager [Windows UEFI CA 2023] is ALLOWED.
\\.\HarddiskVolume1\EFI\Microsoft\Boot\bootmgfw.efi
File Version: 28000.322, SVN 8.0

Registry: WindowsUEFICA2023Capable = 2
[Windows UEFI CA 2023] in UEFI DB, and Windows starting from CA 2023 Boot Manager.

STATUS REPORT
-------------
Registry: UEFICA2023Status = Updated

SUCCESS: UPDATES ARE FINISHED. UEFI CA 2023 certs are present, PCA 2011 cert is revoked.

PS C:\Users\theislands> powershell -nop -ep bypass -f C:\temp\Check_UEFI-CA2023test.ps1 -verbose
Windows 11 25H2 (26200.8246)

Secure Boot: ON
Virtualization Based Security: OFF
BitLocker on (C:) OFF

BIOS Firmware
-------------
ASUSTeK COMPUTER INC. K30AD_M31AD_M51AD
Version: 0802
Date: 2015-08-02

Factory Default UEFI PK Cert
----------------------------
(NONE)

UEFI PK Cert
------------
Windows OEM Devices PK

Factory Default UEFI KEK Certs
------------------------------
(NONE)

UEFI KEK Certs
--------------
Microsoft Corporation KEK CA 2011
Microsoft Corporation KEK 2K CA 2023

Factory Default UEFI DB Certs
-----------------------------
(NONE)

UEFI DB Certs
-------------
Microsoft Corporation UEFI CA 2011
Microsoft Windows Production PCA 2011
Microsoft Option ROM UEFI CA 2023
Microsoft UEFI CA 2023
Windows UEFI CA 2023

Factory Default UEFI DBX Certs
------------------------------
(NONE)
EFI_CERT_SHA256_GUID Signatures: 0

UEFI DBX Certs
--------------
Microsoft Windows Production PCA 2011
Windows BootMgr SVN 8.0
EFI_CERT_SHA256_GUID Signatures: 439

EFI Files
---------
Windows Boot Manager [Windows UEFI CA 2023] is ALLOWED.
\\.\HarddiskVolume1\EFI\Microsoft\Boot\bootmgfw.efi
File Version: 28000.322, SVN 8.0

Registry: WindowsUEFICA2023Capable = 2
[Windows UEFI CA 2023] in UEFI DB, and Windows starting from CA 2023 Boot Manager.

SkuSiPolicy.p7b is CURRENT.
\\.\HarddiskVolume1\EFI\Microsoft\Boot\SkuSiPolicy.p7b
Version: 33284.17421.33440.335

STATUS REPORT
-------------
Registry: UEFICA2023Status = Updated

SUCCESS: NO UPDATES ARE REQUIRED.

PS C:\Users\theislands>
 

My Computers My Computers

System One System Two

  • At a glance

    Windows 11 Home, ver 25H2 build 26200.8246Intel Core i5 5200U @ 2.20GH4 GBIntel HD Graphics 5500 on board
    OS
    Windows 11 Home, ver 25H2 build 26200.8246
    Computer type
    Laptop
    Manufacturer/Model
    Hewlett-Packard Spectre 13-4001 x360 convertable
    CPU
    Intel Core i5 5200U @ 2.20GH
    Motherboard
    Hewlett-Packard 802D
    Memory
    4 GB
    Graphics Card(s)
    Intel HD Graphics 5500 on board
    Sound Card
    Intel Smart Sound Technology (Intel SST)
    Hard Drives
    Micron 256GB M.2 2280 NGFF SSD MTFDDAV256TBN, (SATA 6.0 Gb/s)
    Keyboard
    Model # G01KB
    Antivirus
    Microsoft Defender
    Other Info
    born on date: 25 Feb 2016

  • At a glance

    Win 11 Home 25H2 build 26200.7922Intel Core i7 4th Gen 4790 (3.60GHz), Haswell...Samsung 16 GB DDR3 (8GB in 2 modules)NVIDIA GeForce GTX 760, 3GB, and on-board Int...
    Operating System
    Win 11 Home 25H2 build 26200.7922
    Computer type
    PC/Desktop
    Manufacturer/Model
    Asus Desktop model M32AD-US019S (DOM: 6/9/2014 )
    CPU
    Intel Core i7 4th Gen 4790 (3.60GHz), Haswell 22nm Technology, SOCKET 1150
    Motherboard
    H81M-E/M51AD/DP_MB
    Memory
    Samsung 16 GB DDR3 (8GB in 2 modules)
    Graphics card(s)
    NVIDIA GeForce GTX 760, 3GB, and on-board Intel HD Graphics 4600 Rev 6
    Monitor(s) Displays
    HP EliteDisplay E241i LED; HP EliteDisplay E243
    Hard Drives
    Samsung 500GB SSD, 870 EVO (SATA 6.0 )
    Micron 250GB SSD, CT250MX500
    Toshiba HDD, 3GB (original drive w/PC)
    Case
    ASUS
    Keyboard
    ASUS-------------------------
    Antivirus
    MS Defender
    Other Info
    Additional Laptops:

    HEWLETT PACKARD
    HP OmniBook X Flip NGAI (Next Gen AI),
    Model: 16-as0023dx
    PT# B5UH1UA#ABA Product #: B5UH1UA
    delivered and setup 7/25/25
    16" 2K Touch-Screen Laptop
    Intel Core Ultra 7 256V '24 Series 2 - CPU
    Boost Clock Frequency 4.8 gigahertz; Neural Processing Unit (NPU) Yes;
    16GB Memory, LPDDR5X
    1TB SSD PCIe 4.0
    Graphics: Intel Arc 140V
    1 x HDMI 2.1
    1 x Thunderbolt 4
    2K Touch-Screen display, LED, IPS; 1920 x 1200 (Full HD+)
    USB Ports: 1 x USB-C 3.1, 2 x USB-A 3.1
    Wi-Fi 6E
    weight 4.15 pounds

    DELL
    Model:I7591-7483BLK-PUS 2-in-1 (7000 Series)
    purchased 12/3/2019,
    15.6 inch 2-IN-1;
    4K Ultra HD Touch-Screen, 3840 x 2160,
    Intel Core i7 10510U CPU 1.80GHz,
    16GB RAM DDR4 SDRAM 2400 megahert (2 slots),
    dedicated graphics Nvidia GeForce MX250 2 GB Graphics,
    PCIe 512GB Intel SSD + 32GB Optane Memory (Intel Optane Memory H10 with solid-state storage),
    wireless-AX & Bluetooth
    Battery: 68wh, Type 4VGMP 4 cell
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