[Z2/Z2 Plus] [Z2131/2] Ultimate Bootloader Unlock & TWRP Install Guide

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sammessi10

Senior Member
Mar 25, 2015
63
83
Visakhapatnam
There are many guides for unlocking bootloader and installing TWRP and there are many misconceptions redarding these.
This is the ultimate guide put together to clear all those.
*Use Mozilla Firefox to get the unlock_bootloader image* Chrome isn't working due to bugs in site

Things you need:
1. ZUK Z2 (Z2131/Z2132) [Obviously]
2. "unlock bootlader.img" from developer.zuk.com
3. Minimal ADB and Fastboot from Here
4. Latest TWRP from Here
5. If you want to root download SuperSU from Here
6. MI Flash Tool from Here

Unlocking bootloader factory resets the device, so backup your files before hand.
Getting the Unlock Image:
This one thing is a big problem to attain for many users.
1. Head to developer.zuk.com (Use Chrome to translate the page)
2. Click Login and use the following details
Username: [email protected]
Password: zukaccount!
Account doesn't work anymore, but you can easily create an account now.
(Login before heading to unlock page)
3 .Click Unlock at the top.
4. Click NEXT on Step 1.
5. Select Z2 from dropdown list.
6. Type in your Serial Number. (You can find it at Settings > About > Status > Serial Number)
If you have a 6 character serial number, add two zeros at end
If you have a 7 character serial number, add one zero at end
7. Give your email ID (Gmail works too)
8. Accept the conditions and click NEXT.
9. A Dialog Box opens up stating that you will recieve an email with the bootloader image.
10. Check your Inbox and Spam folders.

Unlocking Bootloader:
1. Install Minimal ADB and MI Flash (to ensure you get all drivers)
2. Place the "unlock_bootloader.img" in the fastboot installation folder.
3. Run following commands.

(a) adb devices [Your device should be listed, if not, check drivers]

(b) adb reboot bootloader

(c) fastboot -i 0x2b4c flash unlock unlock_bootloader.img

You should see this:
"target reported max download size of 1610612736 bytes
sending 'unlock' (0 KB)...
OKAY [ 0.037s]
writing 'unlock'...
OKAY [ 0.053s]
finished. total time: 0.090s"

(d) fastboot -i 0x2b4c oem unlock-go

You should see this:
"OKAY [ 0.041s]
finished. total time: 0.041s"

(e) fastboot reboot
4. You should end up with an unlocked bootloader.

Installing TWRP:
1. Place TWRP downloaded from official site in the fastboot installation folder.
2. Run the following commands.
(a) adb reboot bootloader

(b) fastboot -i 0x2b4c flash recovery twrp.img

(c) fastboot reboot
3. You have successfully installed TWRP

Rooting using SuperSU.zip
1. Place the downloaded "SuperSU.zip" into the root folder of phone to. (That would be easy to find while installing)
2. Reboot to TWRP
3. Select Install and locate SuperSU.zip
4. Swipe to flash.

You should end up with a unlocked and rooted Z2.
Comment for flaws or if you want me to add more info at a specific step.

Note:
If you get a message saying "Daemon started succesfully" re-run the previous command.
TWRP Links:
TWRP 3.1.0
TWRP 3.1.1
TWRP 3.2.1
Thanks to Balraj at zukfans.eu for Login Details
Goodluck Unlocking :good:
Hit thanks if this helped you.
 
Last edited:

AkumDX

Senior Member
Aug 18, 2012
347
119
...
And finally a guide for newbies like me :D btw is there any tool to unlock bootloader and flash ROMs like other devices?
 

MacGyverLarisa

Senior Member
Dec 27, 2011
239
52
Rhodes
Redmi Note 8
i stuck in second step
2. Place the "unlock_bootloader.img" in the fastboot installation folder.?????
where is this location
please help me


i can go in adb mode but i cant find the location
I FIND IT i am soo nood
 
Last edited:

zakaria12

Senior Member
Aug 18, 2014
236
32
OnePlus Nord 2 5G
Capture.png

i cant unlock bootloader :crying: :crying:

---------- Post added 4th June 2017 at 12:33 AM ---------- Previous post was 3rd June 2017 at 11:54 PM ----------

fix it :D
 
Last edited:

akash.mahadeshwar

Senior Member
Dec 10, 2012
214
26
Mumbai
Hi is it possible for any one to upload the TWRP.img file ?
I tried it with the one which is in twrp (twrp-3.1.1-0-z2_plus) app however its not working.
It showed flash completed however its still loading old recovery.
i'm currently on android 7 with boot loader unlocked.
Thanks
 
Last edited:

mity_dev

Member
Aug 5, 2015
41
3
Mumbai
Redmi Note 10 Pro
My device doesn't gets detected in fastboot mode by my pc. I have tried all drivers of Lenovo and other manufacturers drivers but it can't detect my device in fastboot mode. But it detects the phone in adb and gets booted to fastboot mode and when i run the command fastboot -i 0x2b4c flash unlock unlock_bootloader.img.
It shows waiting for device . Please Help anyone!.
 

ast9011

Senior Member
Aug 13, 2012
245
31
29
Nagpore, Pune
My device doesn't gets detected in fastboot mode by my pc. I have tried all drivers of Lenovo and other manufacturers drivers but it can't detect my device in fastboot mode. But it detects the phone in adb and gets booted to fastboot mode and when i run the command fastboot -i 0x2b4c flash unlock unlock_bootloader.img.
It shows waiting for device . Please Help anyone!.

Same with me.. i think it's beacause of nougat as this method is working fine with marshmallow.
 
There are many guides for unlocking bootloader and installing TWRP and there are many misconceptions redarding these.
This is the ultimate guide put together to clear all those.

Things you need:
1. ZUK Z2 (Z2131/Z2132) [Obviously]
2. "unlock bootlader.img" from developer.zuk.com
3. Minimal ADB and Fastboot from Here
4. Latest TWRP from Here
5. If you want to root download SuperSU from Here
6. MI Flash Tool from Here

Getting the Unlock Image:
This one thing is a big problem to attain for many users.
1. Head to developer.zuk.com (Use Chrome to translate the page)
2. Click Login and use the following details
Username: [email protected]
Password: zukaccount!
(Login before heading to unlock page)
3 .Click Unlock at the top.
4. Click NEXT on Step 1.
5. Select Z2 from dropdown list.
6. Type in your Serial Number. (You can find it at Settings > About > Status > Serial Number)
If you have a 6 character serial number, add two zeros at end
If you have a 7 character serial number, add one zero at end
7. Give your email ID (Gmail works too)
8. Accept the conditions and click NEXT.
9. A Dialog Box opens up stating that you will recieve an email with the bootloader image.
10. Check your Inbox and Spam folders.

Unlocking Bootloader:
1. Install Minimal ADB and MI Flash (to ensure you get all drivers)
2. Place the "unlock_bootloader.img" in the fastboot installation folder.
3. Run following commands.

(a) adb devices [Your device should be listed, if not, check drivers]

(b) adb reboot bootloader

(c) fastboot -i 0x2b4c flash unlock unlock_bootloader.img

You should see this:
"target reported max download size of 1610612736 bytes
sending 'unlock' (0 KB)...
OKAY [ 0.037s]
writing 'unlock'...
OKAY [ 0.053s]
finished. total time: 0.090s"

(d) fastboot -i 0x2b4c oem unlock-go

You should see this:
"OKAY [ 0.041s]
finished. total time: 0.041s"

(e) fastboot reboot
4. You should end up with an unlocked bootloader.

Installing TWRP:
1. Place TWRP downloaded from official site in the fastboot installation folder.
2. Run the following commands.
(a) adb reboot bootloader

(b) fastboot -i 0x2b4c flash recovery twrp.img

(c) fastboot reboot
3. You have successfully installed TWRP

Rooting using SuperSU.zip
1. Place the downloaded "SuperSU.zip" into the root folder of phone to. (That would be easy to find while installing)
2. Reboot to TWRP
3. Select Install and locate SuperSU.zip
4. Swipe to flash.

You should end up with a unlocked and rooted Z2.
Comment for flaws or if you want me to add more info at a specific step.

Note:
1. Unlocking bootloader factory resets the device, so backup your files before hand.
2. If you get a message saying "Daemon started succesfully" re-run the previous command.
TWRP Links:
TWRP 3.1.0
TWRP 3.1.1

Thanks to Balraj at zukfans.eu for Login Details
Goodluck Unlocking :good:
Hit thanks if this helped you.

Bro I have some questions
1st does Z2 (Z2131) custom ROM could be flashed on Z2 Plus(Z2132)?
2nd of yes then what is brushed ROM
 

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  • 56
    There are many guides for unlocking bootloader and installing TWRP and there are many misconceptions redarding these.
    This is the ultimate guide put together to clear all those.
    *Use Mozilla Firefox to get the unlock_bootloader image* Chrome isn't working due to bugs in site

    Things you need:
    1. ZUK Z2 (Z2131/Z2132) [Obviously]
    2. "unlock bootlader.img" from developer.zuk.com
    3. Minimal ADB and Fastboot from Here
    4. Latest TWRP from Here
    5. If you want to root download SuperSU from Here
    6. MI Flash Tool from Here

    Unlocking bootloader factory resets the device, so backup your files before hand.
    Getting the Unlock Image:
    This one thing is a big problem to attain for many users.
    1. Head to developer.zuk.com (Use Chrome to translate the page)
    2. Click Login and use the following details
    Username: [email protected]
    Password: zukaccount!
    Account doesn't work anymore, but you can easily create an account now.
    (Login before heading to unlock page)
    3 .Click Unlock at the top.
    4. Click NEXT on Step 1.
    5. Select Z2 from dropdown list.
    6. Type in your Serial Number. (You can find it at Settings > About > Status > Serial Number)
    If you have a 6 character serial number, add two zeros at end
    If you have a 7 character serial number, add one zero at end
    7. Give your email ID (Gmail works too)
    8. Accept the conditions and click NEXT.
    9. A Dialog Box opens up stating that you will recieve an email with the bootloader image.
    10. Check your Inbox and Spam folders.

    Unlocking Bootloader:
    1. Install Minimal ADB and MI Flash (to ensure you get all drivers)
    2. Place the "unlock_bootloader.img" in the fastboot installation folder.
    3. Run following commands.

    (a) adb devices [Your device should be listed, if not, check drivers]

    (b) adb reboot bootloader

    (c) fastboot -i 0x2b4c flash unlock unlock_bootloader.img

    You should see this:
    "target reported max download size of 1610612736 bytes
    sending 'unlock' (0 KB)...
    OKAY [ 0.037s]
    writing 'unlock'...
    OKAY [ 0.053s]
    finished. total time: 0.090s"

    (d) fastboot -i 0x2b4c oem unlock-go

    You should see this:
    "OKAY [ 0.041s]
    finished. total time: 0.041s"

    (e) fastboot reboot
    4. You should end up with an unlocked bootloader.

    Installing TWRP:
    1. Place TWRP downloaded from official site in the fastboot installation folder.
    2. Run the following commands.
    (a) adb reboot bootloader

    (b) fastboot -i 0x2b4c flash recovery twrp.img

    (c) fastboot reboot
    3. You have successfully installed TWRP

    Rooting using SuperSU.zip
    1. Place the downloaded "SuperSU.zip" into the root folder of phone to. (That would be easy to find while installing)
    2. Reboot to TWRP
    3. Select Install and locate SuperSU.zip
    4. Swipe to flash.

    You should end up with a unlocked and rooted Z2.
    Comment for flaws or if you want me to add more info at a specific step.

    Note:
    If you get a message saying "Daemon started succesfully" re-run the previous command.
    TWRP Links:
    TWRP 3.1.0
    TWRP 3.1.1
    TWRP 3.2.1
    Thanks to Balraj at zukfans.eu for Login Details
    Goodluck Unlocking :good:
    Hit thanks if this helped you.
    3
    My device doesn't gets detected in fastboot mode by my pc. I have tried all drivers of Lenovo and other manufacturers drivers but it can't detect my device in fastboot mode. But it detects the phone in adb and gets booted to fastboot mode and when i run the command fastboot -i 0x2b4c flash unlock unlock_bootloader.img.
    It shows waiting for device . Please Help anyone!.

    Same with me.. i think it's beacause of nougat as this method is working fine with marshmallow.

    Try this guide
    Click Here
    2
    i stuck in second step
    2. Place the "unlock_bootloader.img" in the fastboot installation folder.?????
    where is this location
    please help me


    i can go in adb mode but i cant find the location
    I FIND IT i am soo nood
    Generally it is Program Files or Program Files (x86) > Minimal ADB and Fastboot
    2
    Is there any alternate?

    For all that who wants to unlock a bootloader!

    Administration of site (http://developer.zuk.com/bootloader) has responded to me that they faced with DNS problem and are trying to fix it.
    You need to write a message with serial number of your phone to get bootloader unlock file.

    Example of a message:

    To: [email protected]
    Topic: Bootloader unlock
    Message: Hello. Please, provide me with bootloader unlock image. My phone is Z2 and serial number is ********. Thanks in advance, (your name).

    P.S. Press that button on the site to write a message:
    2
    Thanks for the guide. Pls do add that ZUK Z2 is not recognized as a device in fastboot.

    So one must specify the OEM id . The code is "-i 0x2b4c " for Zuk Z2. So any command fastboot must be suffixed with the following code: -i 0x2b4c