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

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Electry

Senior Member
Apr 19, 2015
251
603
Slovakia

5v94df.jpg

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:
    15646qf.jpg
  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.
    4htijn.jpg

    (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.
    2cdcytv.jpg
  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
 
Last edited:

ppllpp

Senior Member
Feb 17, 2009
79
16
Ok,I had not read all the way down the first post .
 
Last edited:

drpainster

Senior Member
Dec 15, 2010
65
5
Belgrade
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!
 
Last edited:

Electry

Senior Member
Apr 19, 2015
251
603
Slovakia
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)
 

patko226

Senior Member
Mar 19, 2008
316
3
Dolny Kubin
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
 
Last edited:

underr.t

Senior Member
Jul 26, 2013
142
33
38
Teslić
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??
 
Last edited:

underr.t

Senior Member
Jul 26, 2013
142
33
38
Teslić
DriverInstaller64 won't start at all. I even put it in Windows Vista compatibility mode - still nothing. I'm running Win10 64 bit ver.

---------- Post added at 09:50 PM ---------- Previous post was at 09:16 PM ----------

this is is the message I get in qfill util after following all steps(is that normal or it didnt unlocked bootloader):
Reset Phone
Waiting for reset done...
Download Fail:FireHose Fail Fail to find QDLoader port after switch
Finish Download
 
Last edited:

SilveRRing

Member
Dec 28, 2011
10
0
46
Lisbon
I have this problem too. But I'm using Windows 10. Does anyone have this problem and was able to solve it? I'm stuck with a locked bootloader, without Gapps and I can't go backwards ou upwards in ROM version. The code *#*#8899*#*# doesn't do anything either, no new devices in Windows device manager.
 

bnsuki

Senior Member
Nov 1, 2010
73
7
Toronto
I wasn't able to install the Qualcomm drivers either but the Qfile still worked for me. It seems some lenovo phones come with the drivers in the phone that automatically install when you connect it via usb
 

muscle man

New member
Feb 23, 2016
1
0
the qpst2.7 is not installing on my windows 8. wat can i do?

the qpst2.7 is not installing on my windows 8. wat can i do?
 

smorad

Member
Jan 25, 2014
40
0
i can not unlock bootloader
qfil is give me error...

COM Port number:20
Sahara Connecting ...
Download Fail:QC.QMSLPhone.PhoneException: Could not connect to the COMPORT

at QC.QMSLPhone.Phone.ConnectToServer_Sahara(UInt32 comPort, UInt64& version, Int32 mode, UInt64 timeout)

at QC.SwDownloadDLL.SwDownload.QPHONEMSSaharaDownloadArmPrg(UInt64& version, String armPrgPath)
Download Fail:Sahara FailValue cannot be null.

Parameter name: key
Finish Download
 
G

GuestK00219

Guest
ignore, i posted some bull**** here
 
Last edited:

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  • 21

    5v94df.jpg

    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:
      15646qf.jpg
    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.
      4htijn.jpg

      (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.
      2cdcytv.jpg
    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
    1
    1
    I really like that phone, the screen is gorgeous and the build quality is excellent... However, if you don't manage to unlock the bootloader (like me) then you're stuck at 5.0.1, and considering that Android 7 is already out there :(
    1
    I too love the design. Its F**King awesome :) I cant help buying.

    Then good luck with the purchase! :good:

    And keep us updated if you manage to unlock the bootloader, unfortunately the feedback in this thread is very sparse ... :crying:
    1
    HI I have same build as you (K920_S288_160224_ROW), did you manage to do it? Also I do not understand, I presume I have to root it at first? How do I do it on this build, there are some how to's but none has our build in supported list :(
    Thanks Niko

    ps Kako je u Bugarskoj komsija :) pozdrav iz Beograda
    Zdravo, nikods!

    Yes, the unlock procedure was successful.
    I had SuperSU installed on the stock K920_S288_160224_ROW before that. But, I don't think root is needed when you unlock the bootloader.
    When you flash a CM/LA-based ROM later on, you will have root in it.

    I used QPST 2.7.437 (because I had it already installed for the root procedure) instead of the suggested here QPST 2.7.422.
    Be sure to follow exactly the unlock guide. And also, do as I did - when you choose the necessary files, exit QPST, then start it again, check the paths in QPST and then do the unlock.
    Far as I remember, it required a bit of speed with 3 hands altogether to start flashing while port open, but it was successful after all.

    Pozdrav and ziveli! ;)