write sc6820 backup failed

model :one mini before format i read flash after that the phone on off. see the log:

Internal version: SPRD3
Boot downloaded.
Start boot please wait a moment….
Spreadtrum Boot Block version 1.1
Boot downloaded.
Boot downloaded.
Flash ID: 009800BA9055
FLASH LEN:0x10000000
>>Ready to read/write again, please remove the power supply clip or battery and then re-loaded it.