spd reading firmware always fail,help?

1. Remove battery. Insert battery back
2. Press and hold ‘VolumeUp’ and ‘VolumeDown’ keys
3. Insert cable

==== Wait for phone…

Phone found! [ 112 ]
Port Opened
Sync…
InitBoot Done [ 0x81 ] , Ver : SPRD3
Sync…
Sending FDL
[Info] : If SW freeze here more, than 15 seconds – remove cable
FDL Ready!
Boot Ver : SC7730/7731 eMMC Loader v1.1 Inf
Sending FLASH FDL
FLASH FDL Ready!
Boot Ok!

FlashMode Set : Ok!
Detected eMMC Flash , Structure detect Ok!

[FW_READER] : Step #1 Passed!
[FW_READER] : Step #2 Failed!
Error_Info : Connect Failed , USB Debug NOT enabled, or driver NOT installed!

Reconnect Power/Cable!