Help me with oppo F1s flashing

CPU : MT6750
Storage : EMMC
Scatter : G:\Flashfiles\Oppo\F1s\Oppo_A1601_F1S_EX_11_A.15_1 60913\Oppo_A1601_F1S_EX_11_A.15_160913\Firmware\MT 6750_Android_scatter.txt
DA Version : MTK_AllInOne_DA_v3.3001.2017-12-29.16:29
Waiting for Phone in BROM Mode...
Connect Power Off phone now...
Port : MediaTek USB Port (COM6)
Connected to BROM.
Sending Download Agent...
connect DA end stage: 2, enable DRAM in 1st DA: 0
Connected to Download Agent..
Executing Flashing Task...
Stage:
[0] WRITE TO PARTITION [ preloader ]
Flashing Bootloader...
[2] WRITE TO PARTITION [ recovery ]
Flashing Firmware...
Flashing Failed!
Disconnect cable and Power ON phone.