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Howto unlock bootloader and get TWRP on ZUK Z2 Pro

原文链接

DISCLAIMER:
take care, this will erase all data on phone. I'm not responsible for any data loss. Follow the instructions on your own risk!


---------------------------------------

NEW:

You updated to ZUI 3.5 using https://zukfans.eu/community/thread...t-from-zui-1-9-to-latest-zui-for-z2-pro.7851/ ? Congrats!

Once you updated to ZUI 3.5 you don't need to get unlock_bootloader.img anymore.

To activate developer option click 7 times on ZUI version under settings - system - about:
Screenshot_2018-03-26-19-34-27-1283872640.png
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Screenshot_2018-03-26-19-34-40-0745131217.png
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Screenshot_2018-03-26-19-34-58-0044320019.png

Once you did that you get developer options in settings - system:
Screenshot_2018-03-26-19-35-13-0366231732.png

Click on it and activate the options OEM unlocking and USB debugging
Screenshot_2018-03-26-19-36-00-0804789522.png

You can accept the following warning:
Screenshot_2018-03-26-19-35-38-1867382732.png

Now:
  1. Setup ADB and Fastboot on your PC. (can be found here as well: https://forum.xda-developers.com/showthread.php?t=2317790)
  2. Connect your Lenovo ZUK phone to the PC.
    └ If you get a prompt on phone’s screen to Allow USB debugging, tap OK.
  3. Open a command window inside the folder where you saved your adb and fastboot install (I suggest using C:\ZUK). To do this, open the folder and then “Shift + Right click” on any empty white-space inside the folder and select “Open command window here” from the context menu.
  4. Once command window is open, issue the following command to boot device into bootloader mode:
    adb reboot bootloader
  5. Once in bootloader mode, issue the following command to unlock the device:
    fastboot -i 0x2b4c oem unlock-go
    └ You’ll see the following output:
    ...
    OKAY [ 0.041s]
    finished. total time: 0.041s
  6. Now phone will reboot. Let the reboot finish completely. Then do "adb reboot bootloader" again.
  7. now flashing twrp. Download latest twrp version here: https://twrp.me/zuk/zukz2row.html
  8. Make sure the downloaded twrp version is located in adb directory as well. Rename it into twrp.img. Then in command prompt type:
    fastboot flash recovery twrp.img
    (if your device is not recognized check hardware manager for driver. You may use fastboot -i 0x2b4c flash recovery twrp.img instead)
  9. Reboot your phone to system using the following command:
    fastboot reboot

That's it. You unlocked bootloader and flashed twrp.


--------------------------------------------------------------------

OLD:

This is a backup copy of https://www.theandroidsoul.com/unlcok-bootloader-zuk-z2-pro/
All credits to https://www.theandroidsoul.com/unlcok-bootloader-zuk-z2-pro/ !
I just copied it here so everyone can find all related to ZUK here.

How to Unlock Bootloader on Lenovo ZUK Z2 and Z2 Pro
  1. On your Lenovo phone, go to Settings » About » Status information» and make a note of your device’s Serial number.
  2. On your PC, open developer.zuk.com/bootloader websiteusing Chrome browser.
  3. Once the is opened, right-click anywhere on the page and select “Translate to english” from the context menu.
  4. Read the terms & conditions and then click on the Carry on button at the bottom of the page.
  5. On the next page, select your device model from drop-down box.
  6. Next, enter your 8-digit serial number into Serial number box.
    └If you’ve a 7-digit serial number, add a zero (0) to end. If you’ve 6-digit serial number, add two zeros (00) to the end.
  7. Provide your Email ID in the EMail box. Bootloader unlock files will be sent to this E-mail ID.
  8. Tick/check-mark the the two conditions above submit button, and then hit the SUBMIT button.
    └ You’ll get a message on screen in chinese. It means, the unlock file has been sent to your E-mail ID.
  9. Open your email account, look for an e-mail from Lenovo and download the unlock_bootloader.img file from the mail.
  10. Put the unlock_bootloader.img file in a separate folder on your PC.
  11. Setup ADB and Fastboot on your PC. (can be found here as well: https://forum.xda-developers.com/showthread.php?t=2317790)
  12. Enable Developer Options, USB Debugging & OEM unlock on your device.
  13. Connect your Lenovo ZUK phone to the PC.
    └ If you get a prompt on phone’s screen to Allow USB debugging, tap OK.
  14. Open a command window inside the folder where you saved unlock_bootloader.img file in Step 10. To do this, open the folder and then “Shift + Right click” on any empty white-space inside the folder and select “Open command window here” from the context menu.
  15. Once command window is open, issue the following command to boot device into bootloader mode:
    adb reboot bootloader
  16. Once in bootloader mode, issue the following command to flash the unlock_bootloader.img file to the device:
    fastboot -i 0x2b4c flash unlock unlock_bootloader.img
    └ You will see a similar output on command window as shown in box below:

    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
  17. Once unlock_bootloader.img file is flashed successfully, issue the following command to finally unlock bootloader on your Lenovo ZUK phone:
    fastboot -i 0x2b4c oem unlock-go
    └ You’ll see the following output:

    ...
    OKAY [ 0.041s]
    finished. total time: 0.041s
  18. now flashing twrp. Download latest twrp version here: https://twrp.me/zuk/zukz2row.html
  19. Make sure the downloaded twrp version is located in adb directory as well. Rename it into twrp.img. Then in command prompt type:
    fastboot flash recovery twrp.img
  20. Reboot your phone to system using the following command:
    fastboot reboot

That's it. You unlocked bootloader and flashed twrp.
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