People rushed to download this exact version of Flashtool to "roll back" their Sony Xperia Z, Z2, or Z3 to more stable versions of Android.
Flashtool is a powerful Windows-based flashing and utility suite designed primarily for Sony Ericsson and Sony Xperia devices. Unlike official tools (such as Emma or PC Companion), Flashtool allows users to flash , install custom kernels, root devices, recover from soft-bricks, and even unlock bootloaders—all without needing an unlocked bootloader for basic firmware flashing.
The terminal continued:
: This release is designed for Windows, though Linux versions exist for similar tasks.
However, if you own an , Flashtool 0.9.18.6 is still the best choice.