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

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By sammessi10, Member on 1st June 2017, 07:27 AM
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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
Hit thanks if this helped you.
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2nd June 2017, 04:31 AM |#2  
AkumDX's Avatar
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And finally a guide for newbies like me btw is there any tool to unlock bootloader and flash ROMs like other devices?
2nd June 2017, 11:05 AM |#3  
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Quote:
Originally Posted by AkumDX

And finally a guide for newbies like me btw is there any tool to unlock bootloader and flash ROMs like other devices?

Happy that this helped you. I don't​ think there is any tool for unlocking and flashing (I think you are refering to ODIN for Samsung). But you can use QPST or MI Flash to flash Stock ROMs.
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3rd June 2017, 08:04 PM |#4  
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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
4th June 2017, 01:33 AM |#5  
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https://img.xda-cdn.com/nyBCZ_RoOz8n5OH5DctEL-eUSdM=/https%3A%2F%2Fs22.postimg.org%2F715wt8p35%2FCapture.png
i cant unlock bootloader

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

fix it
4th June 2017, 03:32 AM |#6  
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Quote:
Originally Posted by MacGyverLarisa

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
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4th June 2017, 03:41 AM |#7  
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Quote:
Originally Posted by zakaria12

i cant unlock bootloader

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

fix it

Did you fix it? If not check if you have given your serial number correctly on unlock request page. You need the device specific image
4th June 2017, 08:31 AM |#8  
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Quote:
Originally Posted by sammessi10

Generally it is Program Files or Program Files (x86) > Minimal ADB and Fastboot

Thank you for your response
After a little thought
I Put it inside the folder that I start to adb mode and it works perfectly
20th June 2017, 11:06 AM |#9  
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Is it possible to regain warranty after locking bootloader or is the warranty lost ?
21st June 2017, 03:36 AM |#10  
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Smile
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
22nd June 2017, 07:44 AM |#11  
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Quote:
Originally Posted by zakaria12

https://img.xda-cdn.com/nyBCZ_RoOz8n5OH5DctEL-eUSdM=/https%3A%2F%2Fs22.postimg.org%2F715wt8p35%2FCapture.png

i cant unlock bootloader

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

fix it

how did you fix that?
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