Sony did not provide an official bootloader unlock tool for most retail units, making recovery from a soft-brick reliant on specialized —firmware intended for Sony’s authorized repair centers.
A genuine service flash file (usually .RIFF , .BIN , or .JPG for JTAG) contains:
Based on your request, this guide covers the (specifically the Sony Xperia S LT26i and the Sony Xperia Sola MT27i , which are commonly associated with the S1 platform in service tools).