Tested on Lenovo Zuk2 and Zuk2 pro/ Z2 Plus
Unlocking bootloader factory resets the device, so backup your files / remove email
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
1. Head to developer.zuk.com (Use Chrome to translate the page)
2. Click Login and use the following details
(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