Hướng dẫn Unlock bootloader cài recovery Lenovo vibe Z2 Pro K920

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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 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!

XDA:DevDB Information
[GUIDE] Unlock bootloader on Lenovo VIBE Z2 Pro, Tool/Utility for the Android General

Contributors
Electry, SevenMaxs


TWRP

New, completely rebuilt
Team Win Recovery Project
for Lenovo VIBE Z2 Pro (K920) ROW.

Lollipop comes with newer version of bootloader which needs to be unlocked first!


Features
  • OTA Updates support
  • Full SELinux support
  • Mounting phone storage to PC via MTP
  • USB-OTG (exFAT & FAT32)
  • Fully functional ADB
  • Battery charging
  • Materialised theme by z31s1g

Additional partitions info

  • Modem - /modem
  • Efs - /fsg, /modemst1, /modemst2
  • Mrd - /mrd
  • Persist - /persist
  • Preload - /preload
  • Aboot (bootloader) - /aboot
  • Firmware-update - /sbl1, /rpm, /tz, /dbi
  • Splash - /splash

How to enter recovery
Hold the POWER button and BOTH VOLUME buttons simuntaneusly until you see the logo.

One-Time boot
  1. Enable ADB debugging (in Developer Options)
  2. Reboot into bootloader / fastboot mode (adb reboot-bootloader)
  3. Boot into recovery.img (fastboot boot recovery.img)
  4. Done!

How to flash
  1. Install ADB+Fastboot with drivers (I recommend this installer)
  2. Enable ADB debugging on your phone (in Settings->Developer Options)
  3. After connecting the phone to the PC, pop up may appear, tick Always allow from this computer and click OK
  4. Extract downloaded recovery zip and copy .img file to C:/adb
  5. Now open cmd line (press Start+R, type "cmd", press OK) and go to C:/adb (type "cd C:/adb" and hit Enter)
  6. Reboot into bootloader (type "adb reboot-bootloader")
  7. Your phone should now reboot into the bootloader (Little green android logo in the middle of the screen)
  8. Flash the recovery.img (type "fastboot flash recovery recovery.img")
  9. Now boot into the recovery (type "fastboot boot recovery.img")
  10. Mount /system partition (In TWRP go to Mounts and tick System)
  11. In TWRP open File Manager, go to /system and rename recovery-from-boot.p to recovery-from.boot.p.bak
  12. Finally, reboot!
  13. Done!


Disclaimer
I am not responsible for anything that happens to your phone or computer. You have to understand what you are doing.


Download
TWRP 2.8.7.0 (15 MB)


CN Devices
There is limited support for CN devices although most features (backup/restore, etc...) should work fine.
I don't own CN device, therefore I can't "add" full support for them.

Screenshots

XDA:DevDB Information
TWRP for Lenovo VIBE Z2 Pro, Tool/Utility for the Android General

Contributors
Electry

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