RCA tab stuck

I have one RCA tab RCT6773W22 stuck on RCA screen.
When I try to formate it I got following error ,

Card found : S/N : , v0129
Chinese Miracle II [MTK module] v 1.40

Operation : Format FileSystem [ v1.40 ]

1. Power Off Phone , Remove battery , Insert back
2. Insert USB cable. In some cases require hold BootKey

Wait for phone…
Phone found! [ 27 ]
Sync…
Inital regs read done
Boot Info :
BB_CPU_ID : 8127
BB_CPU_HW : CA03
BB_CPU_SW : 8A00
BB_CPU_SB : 0000
BB_CPU_NM : [MediaTek] MT8127_S00
Processing BROM stage
SecCfgVal : 0x00000000
BromVersion : 0xFF
BLVersion : 0x01
Preloader Status : Alive
Processing DA stage
DA Select done , sending
DA Ver : MTK_AllInOne_DA_v5.1540.01.01
NAND_ID : 004500DE009400930076005000080000
eMMC_ID : 00000000000000000000000000000000
DA Stat : v4.2 on BBID : 0x8D
DA Sent. Configure setting now …
DA started successuflly
NAND FlashIC initialized
[NAND] : FLASH_VEN : 0x004D , [MNAND] mNAND
[NAND] : FLASH_DIE : 0045 00DE 0094 0093 0076 0050 0008
[NAND] : FLASH_LEN : 0x200000000
[NAND] : FLASH_EXT : 4000/0100/00
INT RAM : 0x00020000
EXT RAM : 0x40000000
BOOT TYPE : NAND_FLASH_BOOT
SOC VERIFY : C1
Boot Ok!

Error read initial info , blank flash or wrong settings?

Operation Failed
Elapsed: 00:00:11
Reconnect Power/Cable!

How to solve it?