Chris create 2019/1/21:

how to use blankflash package to make the "brick" unit working again:

1. enter MTK download mode:
   normally, MTK Can enumlate 2 kinds ports. BootRom Vcom and Preloader Vcom
   BootRom Vcom:
     1. blank borad always enumlated BootRom Vcom
     2. emergency download mode(hard key,power + vol- ) can enumlated BootRom Vcom

   Preloader Vcom:
     if the unit has flashed a workable preloader.
     every boot unit will enumlated perloader Vcom 2.5 second for handshake with MTK
   console mode tool(SP_download_tool.exe).

2. download:
     So, you can run blank-flash.bat
      then connect unit to PC via usb cable, then let
      phone reboot (preloader Vcom)
      or power up the unit (preloader Vcom)
      or hold both power key + vol- key (bootrom Vcom)
      or blank baord (bootrom Vcom)
    SP_download_tool.exe can correctly handshake with phone.
    Then the connection should setup, we can see log likewise "Insert comport: COM8"
    prompt in cmd.exe tool.

3.example:
  1. run blank-flash.bat
        working path= F:\project\MTK\image\Jimny\releasekey\lima_32_oem_user_9_PMD29.67_72523_release-keys_oem\blankflash
        Loading Da...
        Loading Da OK!

        Loading Scatter file...
        ChecksumLevel = 2!
        Loading Scatter file success!

        Loading AuthFile...
        Loading Auth OK!

        Waiting for com port cable insert...
        Please insert comport...
        Insert comport: COM8

        Doing download,Please wait...
        Stage: SGPT
        Stage: PGPT
        Stage:
        [0] WRITE TO PARTITION [ preloader ]

        Stage:
        [23] WRITE TO PARTITION [ efuse ]

        Stage:
        [32] WRITE TO PARTITION [ sspm_a ]

        Stage:
        [37] WRITE TO PARTITION [ lk_a ]

        Stage:
        [39] WRITE TO PARTITION [ dtb_a ]

        Stage:
        [40] WRITE TO PARTITION [ dtbo_a ]

        Stage:
        [41] WRITE TO PARTITION [ tee_a ]

        SP_DownloadThread::Write_fastboot_flag() success!

        Download success and rebooting to fastboot mode.
        Please do NOT remove mobile...
        DoWatchDogReset(): Watchdog reset...
        DoWatchDogReset(): Disconnect with DA
        Download success!
        请按任意键继续. . .

    please notes:
        Insert comport: COM8
     the comport is different if you use different PC or the same PC
     but different USB ports. it's auto enum, no need care the real
     port number. it should ok for COM*.


 2. kick any key in you coumpter, the download script show exit
    and cmd.exe should disappered.

 3. check you unit should enter into fastboot mdoe

 4. then you can upgrade special partition or flashall.bat as you want.
