Power off the phone, disconnect and reconnect the battery(if possible) and connect USB cable...
Using Port:
AUTH info: MEIZU, version: 0
Boot META MODE...
Hold the VOL DOWN to force MediaTek BootROM.
Scanning BootROM or Preloader port... Done.
Detected MediaTek USB Port (COM8)
Connection status: XHCI:HUB3:USB 2.0 High-Speed
USB Driver: [MediaTek Inc.] wdm_usb, version: 3.0.1504.0, date: 1-22-2015
Boot META MODE from BootROM ... Done.
Scanning META port... Done.
META port detected: MediaTek USB VCOM (Android) (COM20)
Boot META MODE successfully.
Modem info:
BaseBand chip: MT6755
SW time: 2000.00.00
DSP firmware version: 1.0
DSP patch version: MOLY.LR11.W1539.MD.MP.V9.P20
SW version: HQ6755_66_B1A_L_HW
HW version: Unknown
Melody version: LWCTG
AP info:
Platform: MT6755,S01
Build version: Flyme 6.2.0.0G
SW version: AL1518_999A_V0_0_9_1229_BSP
SW time: Fri Dec 22 10:19:21 CST 2017
HW version: S01
Writing imei...
imei[1]: 35530607341xxxx
imei[2]: 35530607341xxxx
IMEI written successfully.
Writing Wifi Mac (00:00:3c:b8:bc:3a)...