To set the language and regional preferences on a LineageOS device using adb, you can use the settings command to modify the system settings directly. Here’s how you can do it:

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1. Check Current Language Settings

First, check the current language and locale settings:

bash
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adb shell settings get system system_locales

This will return a string like en-US or fr-FR.

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2. Set a New Language and Region

Use the following command to set a new language and region (e.g., French for France):

bash
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adb shell settings put system system_locales fr-FR

Replace fr-FR with your desired locale (e.g., en-US, es-ES, de-DE).

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3. Verify the Change

Check if the change was applied:

bash
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adb shell settings get system system_locales

The output should now reflect your new setting.

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4. Reboot (if necessary)

Some changes may require a reboot to take full effect:

bash
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adb reboot

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Notes:

• Locale Format: Use the standard language-region format (e.g., en-US, fr-FR, es-ES).
• Multiple Locales: If you want to set multiple locales (fallback languages), separate them with commas:

  bash
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  adb shell settings put system system_locales fr-FR,en-US
  

• LineageOS Version: This method works for most LineageOS versions, but some custom ROMs may have additional requirements.

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