Qmobile W15 SPD 7715 NAND Read Error

Phone found! [ 9 ]
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 : SC7715 Loader NAND v1.1 Infinity
Sending FLASH FDL
FLASH FDL Ready!
Boot Ok!

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

[FW_READER] : Step #1 Passed!
[FW_READER] : Step #2 Failed! Init NAND_ACCON FAILED!
ACCON : 0xFFFFFFFF

Reconnect Power/Cable!