[Lenovo Z5 Pro GT Guides, News, & Discussion] Efigeah:
This tutorial is based on the Lenovo Z5 Pro(L78031 - NO-GT version) tutorial By BadCluster

.Pre-Requirements

ADB means Android Debug Bridge, and it is software that you should always do have installed on your PC.

Pre-Requisite 1

Make sure that you have the drivers for your phone installed on your PC.

If not, you can download and install them from here https://devsjournal.com/usb-drivers-for-all-android-devices.html

Pre-Requisite 2

You must also install: Minimal ADB & Fastboot, you can download the software

from here https://devsjournal.com/download-minimal-adb-fastboot-tool.html

Scrolling through the page you will have 2 options: Download or Portable

(choose the one that you prefer)

Pre-Requisite 3

Make sure you have enabled 'USB Debugging' and OEM Unlocking on your device (read all tutorial before do it, because it will be wiped all data from the phone)

Settings -> Advanced settings -> Developer Options

Settings -> Advanced settings -> Developer Options

PAY ATTENTION: If you do not see the Developer Options menu you need to do this:

Settings -> Device Info -> tap 6 or 7 times on the 'ZUI version' entry

A pop-up should appear, telling you 'now you are a developer'

IMPORTANT NOTE: Before doing this, know that this operation completely reset your device and after rebooting, you will find the phone as if he had just left out of the box. So you'll need to configure your phone again and reinstall all apps.

.Unlock Bootloader

1) Go to: http://developer.zuk.com/bootloader_2

2) Get unlock_bootloader.img:

3) Go to your email download file:

4) After getting the unlock file put it in the same ADB folder

5) Now start the phone in bootlader by doing this:

Connect the phone to the PC

Start the Minimal ADB & Fastboot program from the PC

On the PC screen, type:

adb reboot bootloader

(A request may appear on the phone screen with permission of USB debugging, accept it)

The phone will now restart in Bootloader mode.

6) Now that you are in bootloader mode, from the PC, from the screen

Minimal ADB and Fastboot type:

fastboot flash unlock unlock_bootloader.img

sending 'unlock' (0 KB)...

OKAY [ 0.004s]

writing 'unlock'...

OKAY [ 0.019s]

7)Then type:

fastboot oem unlock-go

OKAY [ 0.019s]

8) This is very important: Ready now your bootloader is UNLOCKED however your smartphone will have

BootLoop

and to arrange you need to do this tutorial: HERE

Done !

----------------------------------------------------------

.How to

Lock bootloader

again:

IMPORTANT NOTE: Before doing this, know that this operation completely reset your device and after rebooting, you will find the phone as if he had just left out of the box. So you'll need to configure your phone again and reinstall all apps.

1) Now start the phone in bootlader by doing this:

Connect the phone to the PC

Start the Minimal ADB & Fastboot program from the PC

On the PC screen, type:

adb reboot bootloader

(A request may appear on the phone screen with permission of USB debugging, accept it)

The phone will now restart in Bootloader mode.

2) Now that you are in bootloader mode, from the PC, from the screen

Minimal ADB and Fastboot type:

fastboot flashing lock

OKAY [ 0.019s]

6) This is very important: Ready now your bootloader is LOCKED however your smartphone will have

BootLoop

and to arrange you need to do this tutorial: HERE

Done !