help st21a dead boot repair

Selected device model: Sony ST21a

Connecting. Please wait...

Resetting target. Please wait...

Medusa JTAG Firmware version 1.1.0.

Medusa JTAG Hardware S64 revision C.

Detected TAP ID: 106040E1, IR Length = 4.

JTAG speed : Auto (RTCK).

VREF level : 1.80 V

CPU : Qualcomm MSM7225A

Core ID : 106040E1

ERROR[008]: Unknown flash device. Device No:ID = 0:00000000.

ERROR[035]: Target device has been powered off during connect.

Resetting target. Please wait...

via Welcome to gsm-tips http://ift.tt/L2Rn3X