The Sony Xperia XZ and X Performance are receiving an OTA update with December security patch with firmware version 39.2.A.0.361.
The update is on the roll as we speak. If you haven’t received the update notification yet on your Xperia XZ or X Performance, be sure to check for it manually from Settings » About phone » System updates.
The OTA update is 142MB in size. While we don’t have an official changelog for it yet, but an update with that size couldn’t be a security patch update alone. Expect some bug fixes and minor performance or functionality improvements as well with the 39.2.A.0.361 update.
Also, know that you cannot rollback to a previous firmware version once you install the 39.2.A.0.361 OTA/firmware version. Sony has specifically mentioned this with the update’s notification.
The OTA update zip isn’t available for download yet to be installed via adb sideload from recovery. But we’ll be sure to update this post with a download link when either the OTA is available or full 39.2.A.0.361 firmware is available for download.