[Lenovo ZUK Z2 (Plus) Guides, News, & Discussion] AstroBiswas:
This Procedure Can Also Be Used To Flash Stock Rom And To Regain Warranty

Scenarios-

1.You Somehow relocked your bootloader while on custom rom

2.Your phone flashes the zuk logo and then screen goes blank with led blinking and you cant see the options to go to fastboot or other modes

3.Your Phone Shows port 9008 or 900e while connected to PC

3.You want to regain your warranty

4.You just want to go back to stock rom

This Guide Is for All of the Above Sceneriaos

Following this guide will revert your phone back to stock ROM nougat while deleting your user data and relocking your bootloader

WARNING

If your device is already bricked and if it goes worse than I am not responsible for it. Do at your own risk.

Prerequisites-

A)Downloads and Drivers

1.ZUK USB Driver https://www.androidfilehost.com/?fid=745425885120716994

2.QPST tool https://www.androidfilehost.com/?fid=673368273298940270

3.Mi Flash tool(Download Latest Version) http://xiaomiflashtool.com/category/download

4.ADB and fastboot Drivers https://www.androidfilehost.com/?fid=529152257862712103

5.Minimal ADB and Fastboot https://xdaforums.com/showthread.php?t=2317790

6.Qualcomm QHSUSB driver https://androidfilehost.com/?fid=673368273298940267

B)QPST ROM

1.Indian Version Nougat http://www.mediafire.com/file/f86cs...SER_Q01080.2_N_ZUI_2.5.104_ST_170418_QPST.zip

2.Chinese Version Nougat

http://s.bs.zui.com/DGDc

Extract these rom to preferably a new folder in the root of c drive

STEPS

INSTALL ALL TOOLS AND DRIVERS GIVEN ABOVE

A)If phone is running fine

1.Enable USB Debugging on your Device and give permission to any prompts

2.Open Minimal ADB and Fastboot and put the following command

adb reboot edl

OR

Put the phone in fastboot mode, Open Minimal ADB and Fastboot and put the following command

fastboot reboot edl

3.Close Window

4.Open Mi Flash Tool

5.Click "select" button on the upper left and browse to the directory where you extracted your stock rom and click refresh on the right COM port shall appear below

6.Click Flash

7.DONT REMOVE OR DISCONNECT THE USB CABLE FLASHING WILL TAKE SOME TIME

8.After success is shown press the power button for sometime until the phone vibrates first boot will take some time

9.Tada! You are back to stock rom along with your WARRANTY!(If Mi flash doesnt work use QFIL as per given in the steps 1 to 4 given below)

B)If phone doesnt bootup

1. Restart your PC and open QFILClick

2. Select "Flat Build" and "Browse". Now navigate to the extracted ROM/Firmware, and select prog_emmc_firehose_8996_ddr.elf.

3.Select the "load xml" button. This will appear a new explorer. One of them will be needed to navigate to the file

rawprogram0.xml the second one will ask for patch0.xml

4.Turn your phone off. Now press and hold the volume + button, while pressing the power button for 0.5 seconds and plug in the

USB cable in the same moment. If it was successful your phone should appear at QPST/QFIL and you are able to press the

download button. Press the download process and wait to finish.

If it fails, In QFIL Change

"Device Type" to eMMC

"Validation Mode" to 0-No validation

"Reset after Download" no needed to tick (optional)

5.If your phone is not detected in the QFIL or it shows up as port 900E then there are 2 ways to get to 9008 mode

I)

a.Unplug your phone from the computer.

b. Press and hold the POWER button until your phone restarting 3-5 times.

c. After the 3rd times (or more), you will see the notification LED goes off in the middle of boot process, and at that time, quick

press VOLUME + button and release the POWER button but keep the VOLUME + button pressed.

d. Your phone will be at POWER OFF status.

e. After your phone is completely off, press and hold the VOLUME +, then press POWER button and connect your USB at the

same time.

f. Your computer will showing a notification about a new port.

g. If you succeed, you will see Diagnostic Port 9008 at QFIL software

II)

Right click on my computer and select MANAGE, then select Device Manager

See if your device is connected as Diagnostic Port 900E

If it is shown as “QHSUSB_BULK” under Other Device

a. Right-click on QHSUSB_BULK and choose “Update Driver Software“

b. Now click on the Browse button and locate the extracted Qualcomm QDLoader drivers.

c. The installation process shall take place immediately and a system notification will appear. Just choose “Install this driver software anyway“.

d.Click the Close button and check back at Device Manager window. You will now see “Qualcomm HS-USB QDLoader 9008 (COM10)” under Ports (COM & LPT) section.

6. Flash your phone using QFIL software once phone connects in 9008 mode and then reboot.

(Alternatively you can also use the Mi Flash Tool once the phone is in 9008 port)

7.Tada! You have successfully unbricked your phone and regained your WARRANTY!

Update: For saving your user data if your phone gets bricked by bootloader getting locked ONLY follow the below guide

How To-

1. How to switch it off

-firstly this is happening because you have locked you're bootloader

- You have black screen and led on so just hold power button then Zuk logo will be flash after that you will get black screen again and again the phone was preparing to reboot but before that the led will get turn off immediately release power button

- You have it Your phone is switched off

(Let it reboot once after that don't leave the power button and after that led will get off for small time this is the time you have to remove finger from power button this is tricky )

2. Going to Bootloader

-Firstly connect the USB to laptop

-after you have switched off your phone press volume up and down together and with holding buttons connect the phone to USB and you will see the fastboot mode

3. Unlock your phone

-Remember the unlock bootloader file in your email re download it and unlock your bootloader again(no need to redownload if you already have it the file is permanent)

- after unlocking phone you will see phone rebooted press power button reboot press volume the volume button and go to reboot option

- go to fastboot and flash the TWRP and you will see that your data on internal storage is present so flash any ROM and you will see your data

Update: Deep flash using Deep Flash Cable And Procedure to make a deep flash cable

Cut the outer rubber and metal covering of usb cable.

Strip a small portion of the black and green wires carefully preferably using a needle to avoid the copper wires to be torn.

Then plug the usb jack into the pc and phone and keep mi flash tool open.

Then touch both the wires(shortcircuit the green and black) using a needle or blunt edge of knief for about 4-5 sec and then remove.

The phone must be in 9008 mode now with COM port open in miflash tool

Now Flash To Your Hearts Content!

After flashing carefully cover the cut portion by putting the rubber casing first and then covering with electrical tape.

So be careful not to tear anything you just need to precisely cut the covering (around 0.5 cm) in the shape of a ring

Happy Flashing!