Adding languages in Windows 10: Known issues
This topic captures known issues that affect language provisioning in Windows 10.
Adding Local Experience Packs (LXPs) in Windows 10 version 2004 and later versions: Known issue
When servicing a Windows image that contains LXPs with a cumulative monthly security update or public preview, the corresponding LXP ISO for that update needs to be downloaded and installed to the system image prior to launching OOBE. If this step is skipped, then the user may experience unexpected language fallback (e.g., see text in a language that they cannot understand) until they are able to update their LXP via the Microsoft Store. Note that LXPs cannot be updated via the Microsoft Store until OOBE is completed (i.e., device has reached the Desktop) and the device has established internet connectivity.
To find the correct LXP ISO for your associated monthly quality update, look for the abbreviation of your update in the LXP ISO filename (e.g., 9B). If a quality update doesn't have a corresponding LXP ISO, use the LXP ISO from the previous release. Entries in the table below are listed from newest to oldest.
| Monthly quality update | Servicing update file name and KB article | LXP ISO part numbers and/or filenames |
|---|---|---|
| *6C (2022) | 2022-06 Cumulative Update Preview for Windows 10 Version 2004 for x64-based Systems (KB5014666) | |
| *4C (2022) | 2022-04 Cumulative Update Preview for Windows 10 Version 2004 for x64-based Systems (KB5011831) | |
| *2C (2022) | 2022-02 Cumulative Update Preview for Windows 10 Version 2004 for x64-based Systems (KB5010415) | |
| *1C (2022) | 2022-01 Cumulative Update Preview for Windows 10 Version 2004 for x64-based Systems (KB5009596) | |
| *11C (2021) | 2021-11 Cumulative Update Preview for Windows 10 Version 2004 for x64-based Systems (KB5007253) | |
| *10C (2021) | 2021-10 Cumulative Update Preview for Windows 10 Version 2004 for x64-based Systems (KB5006738) | |
| *9C (2021) | 2021-09 Cumulative Update Preview for Windows 10 Version 2004 for x64-based Systems (KB5005611) | |
| *8C (2021) | 2021-08 Cumulative Update Preview for Windows 10 Version 2004 for x64-based Systems (KB5005101) | |
| *7C (2021) | 2021-07 Cumulative Update Preview for Windows 10 Version 2004 for x64-based Systems (KB5004296) | |
| *5C (2021) | 2021-05 Cumulative Update Preview for Windows 10 Version 2004 for x64-based Systems (KB5003214) | |
| *4C (2021) | 2021-04 Cumulative Update Preview for Windows 10 Version 2004 for x64-based Systems (KB5001391) | |
| *4B (2021) | 2021-04 Cumulative Update Preview for Windows 10 Version 2004 for x64-based Systems (KB5001330) | |
| *3C (2021) | 2021-03 Cumulative Update Preview for Windows 10 Version 2004 for x64-based Systems (KB5000842) | |
| *2C (2021) | 2021-02 Cumulative Update Preview for Windows 10 Version 2004 for x64-based Systems (KB4601382) | |
| *1C (2021) | 2021-01 Cumulative Update Preview for Windows 10 Version 2004 for x64-based Systems (KB4598291) | |
| *11C (2020) | 2020-11 Cumulative Update Preview for Windows 10 Version 2004 for x64-based Systems (KB4586853) | |
| *10C (2020) | 2020-10 Cumulative Update Preview for Windows 10 Version 2004 for x64-based Systems (KB4580364) | |
| *9C (2020) | 2020-09 Cumulative Update Preview for Windows 10 Version 2004 for x64-based Systems (KB4577063) | |
| *9B (2020) | 2020-09 Cumulative Update for Windows 10 Version 2004 for x64-based Systems (KB4571756) |
*The number aligns to the month (e.g., 9 = September), and the letter aligns to the quality update type. See this blog post for more information on the monthly update terminology and servicing cadence.