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You must ensure your download contains two specific sets of files: Main Data Files
Battlefield 3 English Language Pack Download: Top Methods to Switch Language
Look for the string value named . Right-click it and select Modify . Change the value to en_US .
Open your main game directory. The default path is usually: C:\Program Files\EA Games\Battlefield 3\ or C:\Program Files (x86)\Origin Games\Battlefield 3\ Navigate to the folder, then open the Win32 folder. Open the Loc folder.
You will need to find the English language files. These often come in two parts: a large main pack (sometimes around 800 MB to 1.18 GB) for the single-player and multiplayer assets, and a smaller patch file (around 2 MB) for the latest updates.
Even with the files present, the game will default to its original language unless you "force" it to recognize the new ones. Method A: Registry Editor (Recommended) Change Battlefield 3 Language Files
Even with files added, you may need to edit a config file.
Whenever EA pushes an update to the game or the EA App client client syncs your cloud files, it may overwrite your registry edits. If your game reverts to its original language, simply reopen regedit and re-verify that the values are still set to English and en_US . Corrupted File Errors