Windows 10 2004, SHA-256 list

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  1. Posts : 470
    Windows 10 Pro version 21H2
       #1

    Windows 10 2004, SHA-256 list


    Downloaded the Windows 10 2004.iso but would like to check the SHA256 with a Microsoft published list. Does anyone know where I can find it? At this point I don't know the build number.
    Haven't installed yet on an USB, and my desktop didn't qualify for an update yet in the updates where I only get the yellow notice with a link which tells me that it is not yet ready.
    I find this strange because it's built with run of the mill, off the shelf hardware parts. Nothing out of the ordinary.
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  2. Posts : 1,604
    Win 10 home 20H2 19042.1110
       #2
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  3. Posts : 25,047
    10 Home x64 (21H2) (10 Pro on 2nd pc)
       #3

    ineuw said:
    Downloaded the Windows 10 2004.iso but would like to check the SHA256 with a Microsoft published list.

    How did you download the ISO? If you used the MCT to make the ISO then you didn't actually download the ISO, as such. What you downloaded were the components that the MCT used to construct an ISO. As such, each ISO it makes is a bespoke construct and will have a different sha256 so there is nothing you can check.

    The MCT did verify everything it downloaded though before it constructed the ISO, so you should be confident that it is good.

    At this point I don't know the build number.

    The ISO made by the MCT is currently build 19041.264

    You can check the build of yours with this tutorial.

    See Full Details about a Windows 10 ISO file
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  4. Posts : 470
    Windows 10 Pro version 21H2
    Thread Starter
       #4

    One needs the source hash value to compare it to the download. Knowing the value of an app does not help. SHA verification tool is part of Windows 10 on the Context menu, but couldn't find the source value on the web.
    The full Windows 2004 ISO is available for download only with a MS browser. It is packaged with their MediaCreationTool2004. On activation, there are two choices. Create USB (there must be an USB connected), or save it for later DVD burning.
    Select the DVD option and indicate the folder where you want it saved. The download process is hidden and is not revealed until completed. Select Save the ISO. I assume that the hash check is done during this hidden process.
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  5. Posts : 25,047
    10 Home x64 (21H2) (10 Pro on 2nd pc)
       #5

    ineuw said:
    One needs the source hash value to compare it to the download. Knowing the value of an app does not help. SHA verification tool is part of Windows 10 on the Context menu, but couldn't find the source value on the web.
    The full Windows 2004 ISO is available for download only with a MS browser. It is packaged with their MediaCreationTool2004. On activation, there are two choices. Create USB (there must be an USB connected), or save it for later DVD burning.
    Select the DVD option and indicate the folder where you want it saved. The download process is hidden and is not revealed until completed. Select Save the ISO. I assume that the hash check is done during this hidden process.
    As I said, the MediaCreationTool2004 will create the ISO locally from the components it downloads. It verifies those components before creating the ISO and I assume that it uses a hash check to do that, but this process is hidden and all you see is that the verification succeeded (or failed).

    But the ISO it constructs will be a one-off construct and its hash will be different each time you make an ISO using the MCT so it's not possible to check the finished ISO against any known hash.
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  6. Posts : 470
    Windows 10 Pro version 21H2
    Thread Starter
       #6

    Bree said:
    As I said, the MediaCreationTool2004 will create the ISO locally from the components it downloads. It verifies those components before creating the ISO and I assume that it uses a hash check to do that, but this process is hidden and all you see is that the verification succeeded (or failed).
    But the ISO it constructs will be a one-off construct and its hash will be different each time you make an ISO using the MCT so it's not possible to check the finished ISO against any known hash.
    That's fascinating thanks. It's a brilliant solution to the issues surrounding integrity, security, and uniquely identifying the installation. I am impressed.
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  7. Posts : 35,447
    Win 10 Pro (21H2) (2nd PC is 21H2)
       #7

    Use the Heidoc iso downloader to download a fixed iso, and your wish is granted, and you can sleep happily ever after.

    Windows 10 2004, SHA-256 list-1.png

    (I shrank the original a bit to pack the text in, so it's not as clear as the full size version).

    Downside: you're responsible for picking the appropriate iso, whereas the MS media creation tool ensures you get the appropriate one.
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  8. Posts : 470
    Windows 10 Pro version 21H2
    Thread Starter
       #8

    @ dalchina, thanks for the additional source. I am curious about how they compare. Nevertheless, I find the MS' download approach is impressive, and I admit to a rare instance of commendation for the company. And, under the circumstances, I am not concerned about matching the checksum. And now that their ISO creation is so ingenious, how about attending to the unending stream of irritating bugs, for which one must stop and be distracted by searching for a solution?
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  9. Posts : 35,447
    Win 10 Pro (21H2) (2nd PC is 21H2)
       #9

    Heidoc's iso's are sourced from MS sites, by the way. No doubt if you went there you'd find the same ones.

    See also option 5 e.g.
    Download Windows 10 ISO File

    When to update and in particular to upgrade can be or is at your discretion. Hang back, let others feel the pain. Totally selfish of course, but you might feel less frustrated, unless your irritation is a matter of principle - all too often justified alas.
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  10. Posts : 470
    Windows 10 Pro version 21H2
    Thread Starter
       #10

    dalchina said:
    When to update and in particular to upgrade can be or is at your discretion. Hang back, let others feel the pain. Totally selfish of course, but you might feel less frustrated, unless your irritation is a matter of principle - all too often justified alas.
    I paused the updates on the Desktop because of the waste of time spent on cleaning up two their failed attempts to update from 1909 to 2004.

    Experienced the same with the laptop, but MS blocked my attempts to pause the updates, and forced me to update to 2004. Then kept rolling it back until the rollback failed too and had to start all over again with 1909.
    That's why I wanted the ISO. A complete fresh install of 2004 works well on the AMD based laptop. So far, no problems, so I let them update as they wish.
    Now I want to install 2004 on the desktop and get past this recurring cycle of update woes.
    P.S. I have a lot of 1909 mirrors just in case.
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