While custom ROMs like LineageOS offer newer Android versions (up to Android 10 or 11 via unofficial builds), they often break hardware features specific to the SO-01J. For example, the FeliCa chip (used for Japanese mobile payments like Osaifu-Keitai) only works on the stock Docomo ROM.
Many websites offering "Stock ROMs" are filled with malware, adware, or fake files. Do not download from random forums offering direct EXE installers. Official Sony Xperia XZ SO-01J -Docomo Japan- Stock Rom
until "Flashing finished" appears. Disconnect and power on. While custom ROMs like LineageOS offer newer Android
Enthusiasts and repair technicians often return to the official DoCoMo .ftf firmware for several critical reasons: Official Sony Xperia XZ SO-01J -Docomo Japan- Stock Rom
