Asus ROG Phone II ZS660KL Unlock Bootloader – Comprehensive Guide

We have included all the steps in this post to unlock bootloader on Asus ROG Phone II ZS660KL. Simply, follow this guide and you will end up unlocking the bootloader successfully.

If you get bored with the stock firmware of your smartphone and want to play around with more customization, then you will need to get your device rooted. But you can’t be able to root your device before unlocking the bootloader.

Asus ROG Phone II ZS660KL unlock bootloader

What is Bootloader?

In simple words, a bootloader is a set of instructions that are executed automatically, whenever the device is turned ON. The operating system and Kernel need bootloader instructions to start the boot process and operate the recovery mode.

Moreover, you can find the bootloader on every Android smartphone, but the location may vary depending upon different smartphone brands.

By default, the bootloader of every smartphone is locked. The reason behind it is very obvious as every manufacturer wants the users to stay with their default provided skin and stock ROMs.

But as we know, Android is open-source and that gives more power and benefits to users to customize their smartphones with endless possibilities. Therefore, Android also provides users an alternate route to get a chance to customize their smartphones.

This process requires many hurdles ahead. It starts with unlocking the bootloader and so on the process continues with rooting and at last you can end up flashing the custom ROM on your device.

So, we get to know that unlocking bootloader is the permission for users to make different levels of customization from their end.

Benefits of Unlocking Bootloader
  • Gaining the root access
  • Allows to flash custom recovery
  • Installing different custom ROMs

  • This process may void the phone warranty
  • The performance of your phone might also get affected
  • The process might brick your phone, if anything goes wrong
  • Might become a reason for disturbing the security of your smartphone
  • You might also lose the data available on your phone storage.

How To Unlock Bootloader on Asus ROG Phone II ZS660KL?


  • You need to charge your smartphone to at least 70% or above.
  • Grab the original USB cable of your smartphone.
  • Make a complete back-up of your important data. Note: It will wipe all the data available on your phone storage.
  • Download Asus ROG Phone II ZS660KL Drivers.

Steps To Unlock Bootloader on Asus ROG Phone II ZS660KL

Unlike the other Android smartphones, Asus ROG Phone II ZS660KL is a bit different in terms of allowing unlocking bootloader. Below steps will get your job done successfully.

Note: Unlocking Bootloader Will Cause Factory Reset on Your Device. Make sure to take a complete back-up of your important data!

Step 1: First of all, download Asus ROG Phone II ZS660KL unlocking Tool APK File.

Step 2: Connect your smartphone to a computer via original cable and transfer the downloaded unlock tool apk file to the phone storage.

Step 3: Once, the APK file is being transferred to your phone, now install it on your phone by allowing the unknown source app permission.

Step 4: After the installation, launch the app and accept all the terms and conditions.

Step 5: Now, when you finally enters the App interface, simply tap on the "Press to Unlock your Device".

Step 6: Be patient! wait for the process to get complete as during the process your device might reboot several times and will take longer time on the first boot.

That's it, Now your Asus ROG Phone II ZS660KL has bootloader unlocked successfully.

Asus ROG Phone II ZS660KL Specifications

Asus ROG Phone II ZS660KL unlock bootloader

Asus ROG Phone II ZS660KL comes with 6.59 inches AMOLED touchscreen, providing the resolution of 1080 x 2340 pixels.

Moreover, the phone runs on Android 9.0 (Pie) including ROG UI powered by an Octa-Core processor.

The internal memory of the phone includes 128/256/512 GB paired with 8/12 GB of RAM and 1 TB with 12 GB RAM.

The camera features Dual 48MP + 13MP primary lens with LED flash including other features. In addition, a 24MP secondary lens is available for selfies at front.

It is powered by Li-Po 6000 mAh battery. Officially available in Matte Black, and Glossy Black colors.

Price of Asus ROG Phone II ZS660KL is about 1070 EUR.

How To Boot Asus ROG Phone II ZS660KL Into Fastboot Mode

  • Turn your Phone Off Completely.
  • Now, Press and hold Volume Up, and Power buttons simultaneously.
  • Once, the fastboot interface appears on the screen, release all the buttons.

Now Your Phone is in Fastboot Mode!