Error adding languages to WinPE in Win 11 IoT LTSC

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IdetX

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Good morning, I have a problem. I want to add Mexican Spanish to boot.wim/WinPe to the official Win 11 IoT LTSC ISO from the Microsoft website. I am following the guide from this community, and I believe I already have the files for my language downloaded from the official website.

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However, when I try to implement them in NTLite to the ISO in its boot.wim, I get this error. I have already installed two updates to see if that fixes the problem, but it didn't. I appreciate your help.

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Win 11 IoT LTSC is based on 24H2.

You're installing WinPE add-on's from ADK 10.0.25398.1 (Sep. 2023), which doesn't support 24H2 or later releases.
  • The Windows ADK 10.1.25398.1 (Republished in January 2025) and the Windows PE add-on for this ADK support the following OS releases:
    Windows 11, version 23H2 and all earlier supported versions of Windows 10 and 11
    Windows Server 2022
  • This ADK and Windows PE add-on release have the version "10.1.25398.1". This Windows PE add-on is serviced by Cumulative Updates for Microsoft server operating system version 23H2.
Click to expand...

Please use the W11 24H2/25H2 ADK versions listed on the page you already shared.
 
garlin said:
Win 11 IoT LTSC is based on 24H2.

You're installing WinPE add-on's from ADK 10.0.25398.1 (Sep. 2023), which doesn't support 24H2 or later releases.


Please use the W11 24H2/25H2 ADK versions listed on the page you already shared.
Click to expand...
Hi Lord garlin, right

I downloaded this package from the Microsoft website. I was guided by the date and didn't notice that it said it was only for versions 23H2. I thought that since it was from January of this year, it was the most recent one. Then NTLite didn't specify exactly what it was doing or what was missing, so I didn't realize my mistake. I'm going to try to see if it works. Thank you.

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The last ADK was Dec. 2024, but there was a unrelated MSIX security hole in the ADK Setup installer. So they re-released the ADK again with a different Setup file. The packages are the same inside for both the Dec. 2024 and Jan. 2025 ADK's.
 
garlin said:
The last ADK was Dec. 2024, but there was a unrelated MSIX security hole in the ADK Setup installer. So they re-released the ADK again with a different Setup file. The packages are the same inside for both the Dec. 2024 and Jan. 2025 ADK's.
Click to expand...
Good day, I'm back, and you were right, that was the problem, although I got other errors and I don't know whether to continue. I already had this ISO in Spanish (es-MX), but the terms and conditions were still in English. I wanted to see if I could change them to Spanish (es-MX). Do you think it's possible, or should I not even try because it won't work? Please let me know.
 
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IdetX said:
Good day, I'm back, and you were right, that was the problem, although I got other errors and I don't know whether to continue. I already had this ISO in Spanish (es-MX), but the terms and conditions were still in English. I wanted to see if I could change them to Spanish (es-MX). Do you think it's possible, or should I not even try because it won't work? Please let me know.
Click to expand...
 
garlin said:
Are you using an unattended file to specify the Windows system language? I found a complaint where someone claimed Windows was always using the English EULA even if they added new LP's.

https://superuser.com/questions/142...-always-in-english-in-oobe-even-when-language
Click to expand...
Good morning, I followed a tutorial in my language and downloaded the language pack from this site:

UUP (Unified Update Platform) Generation Project (v2.4.18) [by @rgadguard & whatever127]

This project helps you just download UUP files or download and create an ISO image in one click.
uup.rg-adguard.net uup.rg-adguard.net



I have this version.

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I think there is a new version, but I don't know if it works or how you see the situation, Garlin? Please let me know.
 
You should be able to use those language files for install.WIM.
 
garlin said:
You should be able to use those language files for install.WIM.
Click to expand...
Good morning, Garlin. I managed to install the Windows updates using the dism command and install the language packs. I don't know why NTLite gave me an error when installing the updates, but I managed to do it without any problems using dism. Now I want to change the default language to es-MX, first in boot.wim, but I get this error.

1763423499253.png

ntlite omitted some es-MX language packs to install in boot.wim from those I downloaded from the Microsoft website. It didn't install all of them. I don't know if that's the problem, and if it is, I don't know why it omits them.

I don't know if you could help me, please.

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IdetX said:
Good morning, Garlin. I managed to install the Windows updates using the dism command and install the language packs. I don't know why NTLite gave me an error when installing the updates, but I managed to do it without any problems using dism. Now I want to change the default language to es-MX, first in boot.wim, but I get this error.

View attachment 15289

ntlite omitted some es-MX language packs to install in boot.wim from those I downloaded from the Microsoft website. It didn't install all of them. I don't know if that's the problem, and if it is, I don't know why it omits them.

I don't know if you could help me, please.

View attachment 15290
Click to expand...
I downloaded the WinPE files and extracted them from the correct link.

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Did you run "DISM /Get-Intl" to confirm you correctly applied the LP?
 
garlin said:
Did you run "DISM /Get-Intl" to confirm you correctly applied the LP?
Click to expand...
Good day.
Yes, I just did that, but it only detects the en-US language:

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I think it's because of that issue I mentioned, that not all WinPE packages are installed in NTlite, and also because of dism, from what I just tried:

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It tells me that an update is required, but I had already installed it using dism:

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