Android: Using Flashtool to restore stock Sony Xperia Arc/Arc S to stock firmware/kernel/etc

This guide is for the Sony Xperia Arc and the Sony Xperia Arc S. This works with both LOCKED and UNLOCKED bootloaders. However, this process is more suitable to locked bootloaders, because if you have an unlocked bootloader, you can just use Sony's Official Flash Tool Firmware 4.1.B.0.587, 4.1.B.0.431 or 4.0.2.A.0.62 Prerequisites: ADB Drivers for Xperia Arc/Arc S Flashtool 0.9.9.0 Xperia Stock Firmware either 4.1.B.0.587, 4.1.B.0.431 or 4.0.2.A.0.62 On your phone first: Enable USB Debugging Settings/Developer Options/USB Debugging Enable Unknown Sources Settings/Security/Unknown...