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

[Electry]

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

 

[lookasko]

Relock Bootloader

Hello
is there any way to also relock bootloader?

Thanks

 

[ppllpp]

has anyone tried to unlock version S246 with this method?

 

[ppllpp]

Ok,I had not read all the way down the first post .

 

[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!

 

[Electry]

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)

 

[Z953RR]

is it working on S271 row ROM??

 

[ppllpp]

@Z953RR, worked for me.

 

[patko226]

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

 

[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??

 

[Electry]

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.

 

[underr.t]

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

 

[SilveRRing]

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]

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]

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?

 

[SilveRRing]

Try to install as an administrator or compatibility mode. Good luck

Enviado do meu Lenovo K910 através de Tapatalk

 

[Nandycko]

Not working on s277_151029_ROW i cant unlock bootloader.... pls help

 

[smorad]

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

 

[Kiranveer Singh]

Lenovo Vibe P1

hi guys i have lenovo vibe p1,, plaese help me to unlock bootloader .... plz plz rply me

 

[GuestK00219]

ignore, i posted some bull**** here