Flashtool V0291 13 ((link))

Cause: FlashTool cannot initialize the device’s RAM. Usually a firmware mismatch (e.g., using MT6572 files on MT6582).
Solution:
You can download Flashtool v0.2.91.13 from the official website. Make sure to download the correct version for your operating system.

FTF (Flash Tool File)

Sony Mobile uses the format for their firmware updates. While official channels like "Xperia Companion" only allow updating to the latest approved version, Flashtool allows users to: flashtool v0291 13
- “Download Only” — writes selected partitions, preserves others.
- “Firmware Upgrade” — replaces existing firmware, useful across different firmware versions.
- “Format All + Download” — full wipe then flash; use only when necessary.
FlashTool is a popular software used for flashing firmware on various Android devices. Here's a step-by-step guide on how to use FlashTool v0.2.91.13: Technical Report: Flashtool v0

: A web-based utility from Google used to flash system images to Pixel devices. It includes a "developer mode" for testing beta builds. Sony Xperia Flashtool Cause: FlashTool cannot initialize the device’s RAM

For the latest updates and troubleshooting guides, the XDA Developers forum remains the most reliable community resource for Xperia users.

This report is for educational and diagnostic purposes only. Unauthorized use of such tools may void warranties, violate terms of service, or damage hardware.