buck up cannot return

Action : Write Flash
Tips:
1.Remove Battery, Insert usb cable, Insert battery
2.power off Phone, Remove & Reinsert Battery , insert USB Cable
(In Case Some Phone Required to hold bootkey)
Waiting for Phone Usb….
Phone found [ USB Port:COM26 ]
Connecting…
Connection Done.
Read CPU Info…
CPU_ID: 6572
CPU_SW: 0000
CPU_HW: CA01
uploading boot image to RAM…
Handshake received from Phone.
Detected eMMC FlashType.
Waiting for DRAM detection…
Error: 0xef [ReadInfo].
Load File : J:\cstool buck up\grand neoplus copy MTK6572_1512271948.bin

Programming Flash Image…
Error: failed to write memory.

what is the problem it was working after not safe format dead and cannot return the buck up…

br
shoktong