[Lenovo Zuk Z2 Pro Guides, News, & Discussion] weimerd:
Flash guide ZUK Z2 Pro - （Z2121）(QPST/QFIL):

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Preamble:

This upgrade your Phone to Z2 Pro_CN_OPEN_USER_Q01002.1_M_ZUI_1.9.038_ST_160503 version, for example. Use the latest version of the software or the version for the actual operation.

Backup your data before processing the flash, in order to avoid loss of data!

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This tutorial is for all editions of ZUK Z2 Pro (Z2121).

USB flashing will wipe your internal phone storage!

Flash at your own risk, and alway follow the flashing turtorial.

Please note this tutorial is different than ZUK Z2 (non Pro) flashing tutorial!

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--You'll need a USB-C data-cable to proceed--

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Theoretical it is possible to recover a bricked Qualcomm Phone, just like ZUK Z2 Pro via this method. If you do this for the first time you'll need to download some tools.

With downloading and installing the tools this procedure will take about 10-30 minutes (differs depending on how powerful your computer is)

Without downloading and installing the tools this procedure will take about 5 minutes.

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Let's get startet!

1.0

Download flashtool and ZUK USB driver

Download Flashtool

###REQUIRED### (QPST 2.7.434)

https://www.androidfilehost.com/?fid=24591000424948456

Download USB Drivers

###REQUIRED### (ZUK)

https://www.androidfilehost.com/?fid=24659325368664618

optional (Qualcomm normally installed by QPST flashtool setup)

https://www.androidfilehost.com/?fid=24591020540824824

Download and extract ADB and fastboot

###REQUIRED###

https://www.androidfilehost.com/?fid=24671318762848778

Download Stock ROM

###REQUIRED###

https://www.androidfilehost.com/?w=files&flid=94059

1.0.1 Unzip the downloaded package

1.0.2 Install QPST.2.7.434.msi

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Note: If this screen appears when you double-click on the upgrade tool, you need to download and install the Microsoft .NET Framework 4, you can directly search for and download dotNetFx40_Full_x86.rar

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To prevent any further trouble, please reboot your computer now!

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1.1.1 Click "QFIL" open the upgrade tool; (path: Start Menu - All Programs - QPST - QFIL)

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1.1.2 If you opend QFIL switch to the FireHoseConfiguration and enter the following settings:

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After saving the settings, restart QFIL.

1.1.3 Click "Load Content" button, and navigate to the folder you extracted the ROM you downloaded and navigate to the folder with the contents.xml located in, select the contents.xml and click open. This should be looking like this:

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The QFIL tool will automaticly load all needed files.

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1.1.4 If your phone isn't bricked(Method 1):

Plug in your phone via USB-C cable to your Computer. After this you need to enable developer options. Navigate to Settings - About - ZUI Version and touch it 7 times to enable developer options. After this was successfully navigate to Settings - Advanved Settings - Developer Options - USB debugging and turn it on. Confirm dialog with OK.

Now you only have to navigate to the ADB and fastboot files you extracted and open a command prompt (press and hold "shift" rightclick - select "open command promt windows here")

Type into it: adb reboot edl

---If it fails, turn on "enable_usb_2.0" via Developer Options---

If your phone is bricked (Method 2):

(Turn off your phone.) After it's fully shutdown, press and hold the volume down button and connect your phone to your PC.

Now the QFIL tool should react with the following:

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1.1.5 Press the Download Content button to proceed the flashing.

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1.1.6 If the flashing procedure was successful, this will be promped

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THAT'S IT

1.2.1 Flash finished boot test

After the software upgrade is complete, you should do some test, to confirm whether the software download was successful. Test steps are as follows:

1.2.2. start testing:

After the upgrade the phone should be able to boot.

1.2.3 query software version:

Enter * # * # 5993 # * # * to view the phone software version, phone software version for the software version of the new download.

1.2.4 query the phone number and the IMEI number:

Enter * # * # 2222 # * # * # * 06 # and check the serial number and IMEI number, and backing this time should be consistent.

Last, but not least do OTA updates if available.

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Sources:

Original Thread and source: http://club.lenovo.com.cn/thread-1811698-1-1.html

ROM Source: http://club.lenovo.com.cn/thread-1812430-1-1.html

Thread preserved from beeing deleted from zukfans.eu as it will close its doors soon.