Ensure all firmware .sin files are placed in the exact same directory as the executable. Bootloop After Flashing

It may ask if you want to flash optional partition steps or .ta files. Type n (No) or y (Yes) based on your preferences. Generally, typing n for optional configurations is the safest route for beginners.

Which (Windows, Mac, Linux) is your computer running? Share public link

You can download the latest version of Newflasher , a command-line tool for flashing Sony Xperia firmware, directly from its official development thread on XDA-Developers

If the device fails to boot past the Sony logo, restart the process and allow Newflasher to perform a clean install by flashing all .ta data files, which will factory reset the device. If you need help with specific steps, please let me know: What exact model of Sony Xperia are you flashing?