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[GUIDE][K920] Unlock bootloader on Lenovo VIBE Z2 Pro

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By Electry, Senior Member on 21st May 2015, 04:00 PM
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How to unlock bootloader on Lenovo VIBE Z2 Pro - for ROW and CN version, KK and LP firmware
Tested on ROW version with S226 & S246 & S271 firmware.
Original thread -HERE-

Disclaimer
I am not responsible for anything that happens to your phone or computer. You have to understand what you are doing.

Preparation
  1. Download required files below.
  2. Install necessary drivers - LenovoUsbDriver and Qualcomm USB Drivers.
Unlocking
  1. Extract UnlockBootloader.zip to the root of your drive (C:/) on your PC.
  2. Turn off your phone and unplug the USB cable from your PC.
  3. Install and open the QFIL utility.
  4. Fill in following lines:
  5. Now hold Volume+ button and plug the USB cable to your PC.
  6. (optional) For about ~3 seconds you should see "Lenovo HS-USB QDLoader xxxx" in your device manager.

    (This is just to check whether you have necessary drivers installed correctly)
  7. (optional) Unplug the USB cable and do 5. step again.
  8. Immediately after plugging the USB cable press Download in QFIL utility.
  9. Wait for finish, your phone should reboot automatically.
  10. Done!
Downloads
LenovoUsbDriver 1.0.12 [9.3 MB]
Qualcomm USB Drivers [4.1 MB]
QPST 2.7.422 (QFIL utility) [25.1 MB]

ROW (International version)
UnlockBootloader.zip for Lollipop (ROW) (latest) [243 kB]
UnlockBootloader.zip for KitKat (ROW) [231 kB] Update via OTAs to Lollipop!
CN (Chinese version)
UnlockBootloader.zip for Lollipop (CN) (latest) [243 kB]
UnlockBootloader.zip for KitKat (CN) [231 kB] Update via OTAs to Lollipop!

XDA:DevDB Information
[GUIDE] Unlock bootloader on Lenovo VIBE Z2 Pro, Tool/Utility for the Android General

Contributors
Electry, SevenMaxs

Version Information
Status: Stable
Current Stable Version: s288
Stable Release Date: 2015-05-24
Current Beta Version: s143
Beta Release Date: 2015-05-18

Created 2015-07-31
Last Updated 2015-08-24
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7th August 2015, 04:03 PM |#2  
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Relock Bootloader
Hello
is there any way to also relock bootloader?

Thanks
24th August 2015, 04:12 PM |#3  
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has anyone tried to unlock version S246 with this method?
24th August 2015, 06:32 PM |#4  
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Talking
Ok,I had not read all the way down the first post .
12th September 2015, 08:07 PM |#5  
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I tried this tutorial many times without success (in some reason QDLoader was disappeared).
But (maybe it will be useful for other members), after 6. step, without unpluging the phone and without doing 4. step again, i immediately press download in QFIL. This way was successful!
16th September 2015, 05:48 PM |#6  
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Quote:
Originally Posted by drpainster

I tried this tutorial many times without success (in some reason QDLoader was disappeared).
But (maybe it will be useful for other members), after 6. step, without unpluging the phone and without doing 4. step again, i immediately press download in QFIL. This way was successful!

Sorry, there was typo in 6th step. It is just for checking if you have installed drivers correctly. (you can skip that)
6th October 2015, 10:21 AM |#7  
Z953RR's Avatar
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is it working on S271 row ROM??
6th October 2015, 12:45 PM |#8  
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@Z953RR, worked for me.
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16th October 2015, 01:48 PM |#9  
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how I can check if is bootloader unlocked?

edit: after click on download button, I have message waiting for reset done but phone is starting normally and after that I have message failled....
Download Fail:FireHose Fail Fail to find QDLoader port after switch
29th January 2016, 07:11 AM |#10  
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K... So this is the deal. It seams that I can't install Qualcomm USB drivers on Windows 10(or at least I haven't found a way to do so)... Anyone else had this problem??
29th January 2016, 05:31 PM |#11  
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Quote:
Originally Posted by underr.t

K... So this is the deal. It seams that I can't install Qualcomm USB drivers on Windows 10(or at least I haven't found a way to do so)... Anyone else had this problem??

Any error message or something? It was a long time ago when I did this, but you can try disabling driver signature verification.
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