Select the latest available firmware build number from the list.
A typical build number for this model follows the format 41.x.x.x.x (e.g., 41.3.A.2.192 for the Oreo era), signifying its lineage within the Xperia XZ family. Key Features of the Docomo Firmware
This usually indicates a loose USB connection or a faulty cable. Change your USB port, switch to a different cable, and restart the process. Official Sony Xperia XZ SO-01J -Docomo Japan- Stock Rom
Ranging from Android 6.0 Marshmallow to the final official Android 8.0 Oreo update for this model.
If you previously rooted your device or installed a custom ROM, flashing the stock firmware completely restores the factory state and re-enables official security parameters. Firmware Details for Sony Xperia XZ (SO-01J) Select the latest available firmware build number from
While holding the button, plug the USB cable into your phone.
The first boot after a flash can take up to 10-15 minutes. This is normal as the system builds the cache. Once it boots, you will be greeted with the Japanese Docomo setup screen. Change your USB port, switch to a different
The SO-01J variant includes specialized features optimized for the Japanese market, including FeliCa/Osaifu-Keitai (mobile payments), Area Mail (emergency alerts), and specific Docomo network configurations. Custom global ROMs often break these features.