STOCK FIRMWARE
UMI LONDON STOCK FIRMWARE (click image to download)
HOW TO ROOT STOCK FIRMWARE - for firmware released last 2016
Connect phone via usb. Fire up Minimal ADB and FASTboot and input the following one after another
adb reboot bootloader // phone will reboot to the bootloader fastboot oem unlock // unlocks bootloader. Destroys warranty. Erases all data
press volume up to confirm
fastboot reboot // reboot phone
wait for the process to finish
upon successfully booted into system, download latest supersu
flash twrp 3.1.1 either using sp flash or rashr app,
goto recovery and root your device
HOW TO ROOT STOCK FIRMWARER - for firmware released this year (2017)
just download twrp 3.1.1-0 and flash it using sp flash tool
flash supersu
done!