rda format failed

Chinese Miracle II [RDA module] v 1.04

Operation : Format File System
Settings : SmartFormat is On

Waiting phone …
Connect battery, press and hold ‘VolUP’ + ‘PowerOn’ buttons
Connect USB cable and keep hold buttons, until phone will be detected

Device found!
Handshake Ok!

Processing UBOT init …
Processing FL init …
Handshake with FL failed 🙁

Factory Defaults : Will reset UserData and Settings!
Format USERDATA partition …
Format USER Failed!

Reboot Phone

Elapsed: 00:00:13
Reconnect Power/Cable!

try with new battery still failed…
in device manager driver show with "gadget serial"