Official Sony Xperia X Performance So-04h -docomo Japan- Stock Rom .ftf For Flashtool -

While generic Xperia X Performance (F8131/F8132) ROMs exist, only the SO-04H-specific .ftf maintains full hardware compatibility with Japanese FeliCa and LTE band 19. Flashtool remains the most reliable cross-platform utility for this task.

The SO-04H was successfully restored from a soft-bricked state (boot loop after unofficial LineageOS flash) back to stock Android 7.1 (Nougat) with full Docomo carrier features (1Seg, Osaifu-Keitai, VoLTE). No baseband corruption occurred. While generic Xperia X Performance (F8131/F8132) ROMs exist,

[Current Date]

The study involved: (1) identification of the correct firmware variant (Docomo, Japan, SO-04H), (2) acquisition of the .ftf bundle via XperiFirm integrated within Flashtool, (3) driver installation (Sony Flash Mode drivers and GordonGate), (4) creation of a custom flash script excluding userdata to preserve personal files, and (5) execution of a "clean" flash. No baseband corruption occurred

[A. Researcher]