Windows 11 version 26H2 build 26300.9550 now generally available



 Windows IT Pro Blog:

Windows 11, version 26H2 is now generally available, delivering the next annual feature update for Windows 11. Built on the same servicing foundation as Windows 11, versions 25H2 or 24H2, version 26H2 continues Microsoft focus on providing a predictable, low-disruption update experience for organizations while delivering the latest Windows innovations, security improvements, and management enhancements.

Windows 11, version 26H2 is delivered as an enablement package for eligible devices running Windows 11, versions 25H2 or 24H2. This means you can move to the latest release with minimal deployment overhead and a streamlined installation experience.


What is Windows 11, version 26H2?​

Windows 11, version 26H2 is the latest annual feature update for Windows 11 and continues Microsoft annual release cadence for commercial customers.

Like version 25H2, version 26H2 shares the same servicing branch and underlying code base as previous releases. New features and capabilities have been delivered to supported devices through monthly cumulative updates, with some functionality remaining dormant until activated by the version 26H2 enablement package. This approach reduces disruption while simplifying validation and deployment planning.

Why an enablement package?​

Traditional Windows feature updates often required a full operating system upgrade. For eligible devices running Windows 11, versions 25H2 or 24H2, version 26H2 is activated through a lightweight enablement package.

An enablement package:
  • Activates features already present on the device.
  • Installs similarly to a monthly quality update.
  • Requires a small download.
  • Typically results in faster installation times.
  • Allows your organization to use existing servicing and deployment processes.
Because versions 26H2, 25H2, and 24H2 share a common servicing branch, many organizations might find that validating version 26H2 requires less effort than a traditional feature update.

KB5121794 Enablement Package for 64-bit Windows 11 26H2​
Windows11.0-KB5121794-x64.msu (174 KB)​


OR​

KB5121794 Enablement Package for ARM64 Windows 11 26H2​
Windows11.0-KB5121794-arm64.msu (174 KB)​


What's new in Windows 11, version 26H2​

Windows 11, version 26H2 bundles features and enhancements gradually rolled out over the last year to versions 25H2 and 24H2 in the areas of security, management, accessibility, and productivity.

Security improvements​

Windows continues to build on Microsoft commitment to security by default and security by design.
  • Administrator protection provides just-in-time administrative privileges and profile separation to help harden Windows against elevation-of-privilege attacks. You can enable it through Microsoft Intune or Group Policy.

  • Built-in Sysmon functionality in Windows enables you to capture system events that security tools can use for threat detection. Sysmon is off by default. You can configure it to capture the events your organization needs.

  • Smart App Control can now be turned on or off without requiring a clean installation of Windows, making it easier to block untrusted or potentially harmful apps.

  • Windows Hello Enhanced Sign-in Security expands support to compatible peripheral fingerprint sensors. As such, enhanced biometric sign-in protection is available on more Windows 11 PCs.

  • Post-quantum cryptography improvements include API support for NIST-standardized ML-KEM and ML-DSA algorithms. They include support for key exchange, signing, and decryption through CNG and .NET.
  • Driver security enhancements change how the Windows kernel trusts third-party drivers. They remove default trust for cross-signed drivers while maintaining support for WHCP and designated trusted legacy drivers.

Management and deployment enhancements​

Windows 11, version 26H2 introduces improvements designed to help IT administrators deploy, manage, and secure devices at scale.
  • Windows Autopilot device preparation supports device association. It helps organizations identify trusted devices before enrollment and enabling device-targeted policies, automatic corporate device enrollment, and additional OOBE customization.
  • Windows settings backup and restore expands first sign-in restore to Microsoft Entra hybrid joined devices, Cloud PCs, and multi-user environments. Use it to restore user settings and Microsoft Store apps during device refreshes, upgrades, and migrations.
  • Point-in-time restore for Windows provides another recovery option. Roll back a PC, including apps, settings, and personal files, to a recent automatic restore point.

  • Policy-based app removal gives organizations more flexibility to remove preinstalled Microsoft apps on Enterprise and Education devices. Just specify additional MSIX and APPX packages through Group Policy.
  • RSAT on Arm64 enables IT administrators to use tools including Server Manager, Group Policy Management Tools, DNS Server Tools, DHCP Server Tools, and Active Directory management tools on Windows 11 Arm64 devices.
  • App update orchestration allows participating applications to coordinate updates with Windows Update for improved scheduling and a more streamlined update experience

User experience and accessibility enhancements​

Windows 11, version 26H2 continues to improve everyday productivity with enhancements across Windows experiences.
  • File Explorer adds productivity enhancements including AI actions for working with supported images and summarizing OneDrive and SharePoint documents. Also included are quick actions for work and school accounts, support for additional archive formats, and performance improvements.

  • Windows Search makes results easier to find and understand with previews. It better handles typos and partial app names, identifies result types clearer, and automatically indexes frequently used folders.
  • Start and taskbar enhancements provide additional ways to customize the Windows workspace. Begin with new Start menu views and sizing options, additional taskbar positions, and a smaller taskbar option.

  • Task Manager provides greater visibility into NPU usage, including NPU utilization and memory information. You can also identify applications running in an AppContainer.

  • Magnifier adds clearer screen reader announcements, more precise zoom controls, and screen tint options to improve readability.

  • Narrator adds Braille Viewer, improves reading and navigation in Microsoft Word, and provides more control over how information about on-screen controls is announced.

  • Voice access adds natural language commanding on supported Copilot+ PCs, additional language support, and Voice Isolation to help improve recognition in environments with other speakers or background noise.

Now enabled by default​

Some features that were behind temporary commercial control in Windows 11, version 25H2 are now enabled by default in version 26H2. These include:
  • Windows settings backup, which helps preserve supported Windows settings and Microsoft Store app lists for recovery and device replacement scenarios. Existing administrator-configured policies are still honored.
  • App-specific taskbar actions that help users access common actions directly from taskbar experiences.
  • File Explorer improvements focused on improving navigation and usability within File Explorer.
Some of these features have eligibility requirements. Please see related technical documentation for more details.

For a closer look at new features and enhancements added to Windows 11 since version 25H2, please see What's new in Windows 11, version 26H2.

Servicing and support lifecycle​

Windows 11, version 26H2 continues Microsoft annual Windows feature update cadence. Installing Windows 11, version 26H2 resets the support lifecycle for supported editions, as noted here:

Edition​
Support duration​
Home24 months
Pro24 months
Enterprise36 months
Education36 months

Deployment considerations​

For devices currently running Windows 11, version 25H2 or version 24H2, you can use existing deployment frameworks and update rings to validate and deploy version 26H2.

As with any release, we recommend that you:
  • Validate version 26H2 in pilot environments.
  • Test business-critical applications, representative hardware, and workflows.
  • Expand deployment through existing update rings.
  • Monitor deployment health and known issues.
It is also a good time to review security and compliance requirements and educate support personnel on any new functionality.

Because this release uses servicing technology like that used for monthly cumulative updates, many organizations should experience a streamlined deployment process.

Tools and resources​

Deployment, security, and management tools have been refreshed for this update. These include:
We've also updated key references and documentation:
Monthly release notes for Windows 11, version 26H2 will be added to the update history page beginning with the first monthly security update for version 26H2, slated for October 13, 2026.

And, if you're looking for an easy way to keep up on what's new in the world of Windows management, tune in to my new podcast, Ctrl + Manage. The first episode debuts this Thursday, October 1, here on the Tech Community. Click here to save the date and tune in live.

Start planning for Windows 11, version 26H2​

Windows 11, version 26H2 is designed to make moving to the latest version of Windows familiar and straightforward. If you're managing eligible devices on Windows 11, version 25H2 or 24H2, start by validating the update with a targeted set of devices, applications, and workflows. Then expand your deployment using the tools and processes you already have in place.

As always, we want to hear from you. Drop a comment below and let us know what's working, what questions you have, and what we can do to make managing Windows easier for your organization.


 Source:


See also:


Check Windows Updates


UUP Dump:

64-bit ISO download:

ARM64 ISO download:

 

Attachments

Last edited:
Anyone know of an official source for 26300.9457 but with an install.wim rather than an install.esd?

Yes, I know that I can convert the .esd to .wim, and that is what I have already done but I always like to start off with one pristine original with a .wim when a new major version releases and then I use that to build my updates on.
 

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    Win11 Pro 26H2 (Release Preview)Intel i7-14650HX32 GBNo GPU - Built-in Intel Graphics
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    Win11 Pro 26H2 (Release Preview)
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    Manufacturer/Model
    Acemagic Matrix M5
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    Intel i7-14650HX
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    Win11 Pro 26H2 (Release Preview)Intel i7-1255U16 GBIntel Iris Xe Graphics
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    Win11 Pro 26H2 (Release Preview)
    Computer type
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    Manufacturer/Model
    Lenovo ThinkBook 13x Gen 2
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    Intel i7-1255U
    Memory
    16 GB
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    Realtek® ALC3306-CG codec
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    13.3-inch IPS Display
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    4 TB 4 x 4 NVMe SSD
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    Backlit, spill resistant keyboard
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    Buttonless Glass Precision Touchpad
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    1Gb Up / 1Gb Down
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    Edge
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    Windows Defender
    Other Info
    WiFi 6e / Bluetooth 5.1 / Facial Recognition / Fingerprint Sensor / ToF (Time of Flight) Human Presence Sensor
Anyone know of an official source for 26300.9457 but with an install.wim rather than an install.esd?

Yes, I know that I can convert the .esd to .wim, and that is what I have already done but I always like to start off with one pristine original with a .wim when a new major version releases and then I use that to build my updates on.
No, because you have to wait for the direct download ISO. And since they've declared GA is .9550 the official 26H2 ISO must be that or a later build.
 

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Windows 7
OS
Windows 7
From Microsoft -

As always, we take a measured and data-driven approach to broad availability and will be releasing version 26H2 using a controlled feature rollout.

 

My Computer My Computer

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Windows 11 Pro 25H2
OS
Windows 11 Pro 25H2
Computer type
Laptop
Manufacturer/Model
Toshiba
Wasn't necessary for me, just checking WU worked.
You're right, my others got it too. It was needed for 25H2, that was a gradual roll out.
 

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    Windows 11 HomeAMD Athlon Silver 3050U8GBRadeon Graphics
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    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
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    1TB Samsung EVO 870 SSD (from April 2026: 250GB EVO 850)
    Internet Speed
    150 Mbps
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    Edge, Firefox
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    Defender
    Other Info
    UPDATE - 11 April 2026: due to lid hinges starting to break up this laptop has been retired from active duty. The OS with all software and files has been migrated to my System Seven in 'Other systems' to carry on as my general purpose 'main machine'.

    I've now clean installed 25H2 and used Garlin's scripts to update Secure Boot to CA 2023 and revoke the PCA 2011 certificates. It's new role is to test secure boot issues.

    Info for 2021-2026:
    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.
  • At a glance

    Windows 11 ProIntel® Core™ i5-520M8GB(integrated graphics) Intel HD Graphics
    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
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    1366x768
    Hard Drives
    500GB Crucial MX500 SSD
    Browser
    Firefox, Edge
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    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 Experimental 263xx and 29xxx 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 was a 2-in-1 convertible Lenovo Yoga 11e (1st gen) type 20DA, Celeron N2930, 8GB RAM, 256GB ssd. Unsupported device. This has now been sold. It has been replaced by my System Eight.

    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, Experimental 263xx and 29xxx 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, Hyper-V host machine. Updated to 25H2 on 30th September 2025.

    My SYSTEM SEVEN is a Lenovo Thinkpad T580, 1920x1080 touchscreen, 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. As its new home has an existing digital licence for Pro I've been able to upgrade the migrated OS from Home to Pro.
    29 Sept. 2026 Feature Update to 26H2 through Windows Update by setting the Target Release Version for 26H2.

    My SYSTEM EIGHT is a 2-in-1 convertible Lenovo Yoga 11e (5th gen) type 20LN, Celeron N4120, 8GB RAM, 512GB NVMe ssd, a supported device for Windows 11. Currently running Windows 11 Pro, plus Insider Beta, Experimental 263xx and 29xxx builds as native boot vhdx.
"Repair your PC" is still broken on this new ISO so I will use the @garlin fix Repair_My_BootWIM to fix the problem and if garlin has the time explain the process involved in this relevant thread.

Windows 11 - Fresh Install_2024-10-30_11-36-15.webp
 

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    Windows 11 Pro x 2 + Insider DevIntel Core i9 12900K @ 5.2 GHz2 x Corsair Dominator Platinum RGB (4x16GB To...EVGA GeForce RTX 3080 XC3 ULTRA GAMING 10GB G...
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    Windows 11 Pro x 2 + Insider Dev
    Computer type
    PC/Desktop
    Manufacturer/Model
    My first abomination, I call it the Money Pit One
    CPU
    Intel Core i9 12900K @ 5.2 GHz
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    ASUS ROG MAXIMUS Z690 HERO
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    2 x Corsair Dominator Platinum RGB (4x16GB Total) DDR5-6200 CL36 Dual Channel Kit
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    EVGA GeForce RTX 3080 XC3 ULTRA GAMING 10GB GDDR6X
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    ROG SupremeFX ALC4082 with ESS® ES9018Q2C DAC for pinpoint positioning and dynamics
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    2 x Samsung 43" HDR Neo QLED Mini-LED Tizen Smart TV (QN43QN90DAFXZC) 2024
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    1920 x 1080 @ 150 DPI & 120Hz
    Hard Drives
    2 x Samsung 980 Series - 250GB PCIe Gen3. X4 NVMe 1.4 - M.2 Internal SSD (Windows 11 Pro Dual boot)
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    Corsair HX1000i 80+ Platinum Modular Power Supply 1000W
    Case
    Phanteks Enthoo Luxe Tempered Glass Full Tower Case - Black
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    CORSAIR iCUE H150i RGB Elite 360mm Liquid CPU Cooler
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    Perixx PERIBOARD-732B Wireless Mini Backlit USB Keyboard with Low Profile Keys - US Layout
    Mouse
    Logitech MX Anywhere 2S Wireless Mouse
    Internet Speed
    1000 Mbps
    Browser
    Latest Version Of Firefox & Microsoft Edge Chromium Stable
    Antivirus
    ESET Internet Security
    Other Info
    LG Electronics 14x Sata Blu-ray Disk Rewriter - WH14NS4O
    2 x OREI 4K 4x2 HDMI Matrix Switch With ARC Audio Extraction, HDR & Downscaling (UHD-402D) so I can send the output of my Cable Box, Roku, or any of my 4 computers to either of my TV's separately or simultaneously.
  • At a glance

    Windows 11 Pro x 2Intel Core i9 12900K @ 5.2 GHz2 x Vengeance RGB 32GB DDR5 6400MHz CL32 Dual...ASUS TUF Gaming GeForce RTX 3070 Ti OC Editio...
    Operating System
    Windows 11 Pro x 2
    Computer type
    PC/Desktop
    Manufacturer/Model
    My second abomination, I call it the Money Pit Two
    CPU
    Intel Core i9 12900K @ 5.2 GHz
    Motherboard
    ASUS ROG STRIX Z690-F GAMING WIFI
    Memory
    2 x Vengeance RGB 32GB DDR5 6400MHz CL32 Dual Channel Kit (4x16GB Total) Black
    Graphics card(s)
    ASUS TUF Gaming GeForce RTX 3070 Ti OC Edition 8 GB GDDR6X
    Sound Card
    ROG SupremeFX ALC4082 with ESS® ES9018Q2C DAC for pinpoint positioning and dynamics
    Monitor(s) Displays
    2 x Samsung 43" HDR Neo QLED Mini-LED Tizen Smart TV (QN43QN90DAFXZC) 2024
    Screen Resolution
    1920 x 1080 @ 150 DPI & 120Hz
    Hard Drives
    2 x Samsung 980 Series - 250GB PCIe Gen3. X4 NVMe 1.4 - M.2 Internal SSD (Windows 11 Pro Dual boot)
    PSU
    Corsair AX860 - 860W Modular Power Supply
    Case
    Phanteks Enthoo Pro Tempered Glass Full Tower Case - Black
    Cooling
    CORSAIR iCUE H150i RGB Elite 360mm Liquid CPU Cooler
    Keyboard
    Perixx PERIBOARD-326 Wireless Mini Backlit USB Keyboard with Low Profile Keys - US Layout
    Mouse
    Logitech MX Anywhere 2S Wireless Mouse
    Internet Speed
    1000 Mbps
    Browser
    Latest Version Of Firefox & EDGE Chromium Stable
    Antivirus
    ESET Internet Security
    Other Info
    LG Electronics 14x Sata Blu-ray Disk Rewriter - WH14NS4O
    2 x OREI 4K 4x2 HDMI Matrix Switch With ARC Audio Extraction, HDR & Downscaling (UHD-402D) so I can send the output of my Cable Box, Roku, or any of my 4 computers to either of my TV's separately or simultaneously.
  • 2021 ASUS TUF Gaming A17 - FA706QM Gaming Laptop with a AMD Ryzen™ 7 5800H Mobile Processor, NVIDIA GeForce RTX 3060 Laptop GPU and AMD Graphics (512 MB), 17.3-inch, FHD (1920 x 1080) 16:9, Value IPS-level, Anti-glare display, 2 x 8GB DDR4 3200 SDRAM, Samsung 980 Series - 250GB PCIe Gen3. X4 NVMe 1.4 - M.2 Internal SSD running Windows 11 Pro , Backlit Chiclet Keyboard 1-Zone RGB, Touchpad, 720P HD camera, Wi-Fi 6(802.11ax) (Dual band) 2*2 + Bluetooth® 5.3 Wireless Card

    External Keyboard: Perixx PERIBOARD-326 Wireless Mini Backlit USB Keyboard with Low Profile Keys - US Layout

    External Mouse: Logitech MX Anywhere 2S Wireless Mouse

    External Monitor: Samsung 43" HDR Neo QLED Mini-LED Tizen Smart TV (QN43QN90DAFXZC) 2024
1. You just write the Windows ISO to USB using whatever normal method (MCT or Rufus).

2. Then from a command window, give the USB's drive letter.
Code:
.\Repair_My_BootWIM.bat E:
 

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Windows 7
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Windows 7
Will there be any difference in performance and stability compared to 25H2 (I think it will be marginal)?
 

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  • Zrzut ekranu 2026-09-29 222237.webp
    Zrzut ekranu 2026-09-29 222237.webp
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Windows 11 25H2 ProAMD Ryzen 5 4600H32 GBNVIDIA GTX 1650
OS
Windows 11 25H2 Pro
Computer type
Laptop
Manufacturer/Model
HP
CPU
AMD Ryzen 5 4600H
Memory
32 GB
Graphics Card(s)
NVIDIA GTX 1650
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Realtek Audio
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AMD Radeon (TM) Graphics
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INTEL SSD
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