Vivi v11 flash error

AUTH info: , version: 0
BROM version[1]: 7.1917.3.0
DownloadAgent: MTK_AllInOne_DA.bin
hash: 68a84647e9ea1a7c6d4ef5a778a4f5da01cfab95, size: 8.39 MiB
version: 3.3001.00.00, start addr: 0x40000800
Connecting to BootROM...
Power off the phone, disconnect and reconnect the battery(if possible) and connect USB cable...
Hold the VOL UP to force MediaTek BootROM.
Scanning BootROM or Preloader port... Done
Detected [PL] MediaTek PreLoader USB VCOM (Android) (COM10)
Connection status...

Vivi v11 flash error

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