AUTH info: MTK, version: 1
BROM version[1]: 7.1917.3.0
DownloadAgent: MTK_AllInOne_DA.bin
hash: 7095a5620c431b9c3ca1cde75f05965672495348, size: 4.33 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 DOWN or VOL UP + DOWN(for newer model) to force MediaTek BootROM.
Scanning BootROM or Preloader port... Done
Detected [PL] MediaTek PreLoader USB VCOM (Android) (COM39)
Connection status: UHCI:HUB:USB 2.10 Full-Speed
USB Driver: [MediaTek Inc.] wdm_usb, version: 3.0.1504.0, date: 1-22-2015
Error: failed to open COM port (COM39)!
COM port (COM39) was locked up by system, please try to connect to other USB port.