OPPO R831K Not read info . please help my

OPPO R831K Not read info ……..

* log:

please let me know the cause:

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:COM6 ]
Connection Done.
Read CPU Info…
CPU_ID: 6572
CPU_SW: 0000
uploading boot image to RAM…
Handshake received from Phone.
Detected eMMC FlashType.
Warning: failed to init dram, loading default settings
Waiting for DRAM detection…
Error: 0xef [ReadInfo].

Action completed
Time taken : 00:00:47
Reconnect Battery/USB Cable
CS-Tool Ver 1.38