If your device loops endlessly on the boot animation, you likely skipped the wiping step. Re-flash the firmware and ensure that and Wipe Cache are checked before starting. To help me provide more tailored advice, tell me: What is the exact model of your Xperia device? What operating system is your computer running?

A high-quality USB data cable (connected preferably to a USB 2.0 port on your PC to avoid driver handshaking dropouts).

Includes features to "de-bloat" system applications after rooting. Usage Context & Legacy Status Description

The blue light on the phone should light up, and the flashing process will begin.

Run the file within that folder to install necessary ADB/Flashmode drivers. Step 2: Preparing the Firmware

Flashtool is a popular, open-source tool that enables users to flash firmware on Android devices. Developed by a team of expert developers, Flashtool has become a go-to solution for Android enthusiasts and professionals alike. With its intuitive interface and robust feature set, Flashtool makes it easy to flash firmware, recover data, and even unbrick devices.

The utility functions by communicating directly with the device's bootloader or flash stage when held in Flashmode. It handles the manual installation of .ftf (Flash Tool Firmware) bundles. This allows users to completely overwrite corrupted operating systems, flash custom basebands, or downgrade systems to older Android versions without relying on over-the-air (OTA) updates.