Copy a language package from your desktop to your device.
Note: Language packages are available in this folder: c:\Program Files (x86)\Windows Kits\10\MSPackages\retail\ your-processor-type \fre
For example, to copy Spanish Mexican to an arm based device:
Apply the Speech Language Package to your device. (Required for Windows 10 IoT Builds 15063 or greater)
Note: Your device should reboot after committing each update and a “spinning gears” screen will appear until the update completes.