Flashtool 0.9.23.2 [upd] < EASY ⇒ >

If you are upgrading/downgrading, check USERDATA and CACHE in the "Wipe" pane. (Note: This deletes your data). Step 4: Connecting the Device

Sony’s flashing protocols have changed over the years. Newer versions of Flashtool (0.9.30+ and beyond) added support for A/B partitions, dynamic partitions, and the Xperia 1/5 series. However, they also introduced compatibility breaks with older devices. Flashtool 0.9.23.2

The tool includes a "Bootloader Unlock" utility. It can check the status of the bootloader (unlock allowed/disallowed) and facilitates the unlocking process via Fastboot, which is essential for installing custom recoveries like TWRP or rooting the device. If you are upgrading/downgrading, check USERDATA and CACHE