need help Formatting Error: 0xef

need help Formatting Error: 0xef
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:COM5 ]
Connecting...
Connection Done.
Read CPU Info...
CPU_ID: 6571
CPU_SW: 0000
CPU_HW: CA00
uploading boot image to RAM...
Handshake received from Phone.
uploading boot image to RAM...
Handshake Received from Phone.
eMMC cid: 000000000000000000
Error: 0xef [ReadInfo].

Formatting ...

Action completed
Time taken : 00:00:55
Reconnect Battery/USB Cable
CS-Tool Ver 1.36

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need help Formatting Error: 0xef