itel it 1550

hi
i have itel it 1550 with pattern lock sc7731.software give me error here is log

==== Wait for phone…

Phone found! [ 19 ]
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 : SC773x eMMC v2.0 Loader Infinity
Sending FLASH FDL
FLASH FDL Ready!
Boot Ok!

Unknown structure detected! Check correct model selection!

Elapsed: 00:00:22

Reconnect Power/Cable!