j100f flashing failed always

here is log

File analysis… OK
Total file size: 0x3DACE040 (986 Mb)
Searching USB Flash interface… detected COM8
Setup connection… OK
Reading PIT from phone… OK
Sending loke_1st.bin… OK
Sending loke_2nd.bin… OK
Sending DTim.Primary… OK
Sending DTim.Recovery… OK
Sending boot.img… error
Done with Samsung Tool PRO v.26.8

always failed some time at sending system.img

with single file and also with 4 files

but same

any solution