Most Fujitsu phones sold outside of Japan via importers have the "Global ROM" flashed, or Docomo later enabled English support for certain models. Follow these steps to find the settings menu. I have included the Japanese text for visual matching.
Rooting the F‑04J is difficult and voids warranty, plus it may break docomo’s original features (Osaifu‑Keitai, 1Seg). Not recommended for most users. change language in fujitsu f04j docomo full
The Fujitsu F-04J has a locked bootloader that Docomo refuses to unlock for foreign users. Without an official unlock token (which requires a Japanese MyDocomo account and a paid contract), you cannot root this phone or install a custom ROM. Most Fujitsu phones sold outside of Japan via
uses a specialized "force-touch" screen (you have to press firmly to click) and a simplified UI, it is often more frustrating than a standard smartphone for non-Japanese speakers If you must use it, your best bet is using the Google Lens Rooting the F‑04J is difficult and voids warranty,
have noted that certain Japanese-market Fujitsu phones may have limited language options or may require an "English patch" for full system translation Standard vs. Simple Menu:
If your device is currently in Japanese, use these visual cues to find the correct menus: Open Settings : Locate the Settings (設定)