How to Relock the Bootloader on Asus Devices

Relock the Bootloader on Asus Devices: In this tutorial, we will show you how to relock the bootloader on Asus devices. Asus is one of the few major smartphone manufacturers that allow users to unlock the bootloader on their devices. This is great for those who want to root their phone or install a custom ROM.

However, there are some drawbacks. One of these is that you will no longer be able to receive official OTA updates from Asus. This means that you will have to manually flash these updates yourself.

Another drawback is that relocking the bootloader will void your warranty. So if you do decide to unlock your bootloader, make sure you do it with a backup in place in case something goes wrong. With that being said, let’s take a look at how to relock the bootloader on Asus devices.

What is a Bootloader?

If you’re an advanced Android user, you’re probably familiar with the term “bootloader.” A bootloader is a low-level piece of software that tells your device how to start up. When you power on your Asus device, the bootloader is what loads the operating system into memory and starts it up.

Most manufacturers lock the bootloader on their devices to prevent users from making changes that could potentially brick the device. However, some manufacturers allow users to unlock the bootloader, which gives them more flexibility in terms of customizing their devices.

If you’ve unlocked the bootloader on your Asus device, you may want to re-lock it at some point. Re-locking the bootloader is a relatively simple process, and it can be done using ADB commands. In this article, we’ll show you how to re-lock the bootloader on Asus devices.

What is an Asus Device?

An Asus device is a mobile computer, smartphone, or tablet manufactured by AsusTek Computer Inc. Relocking the bootloader on an Asus device resets the Tamper Flag and prevents unauthorized software modification or “flashing” of the device. To relock the bootloader on your Asus device, follow these steps:

How to Relock the Bootloader on Asus Devices

You can Relock the bootloader on Asus devices by following the Steps given below:

Method 1: Remove all the Modules and Root from your Asus Device.

If you want to relock the bootloader on your Asus device, you first need to remove all modules and root. To do this, you’ll need to use a custom recovery like TWRP. Once you’ve booted into TWRP, go to the Wipe menu and select Advanced Wipe. Then, select the Dalvik/ART cache, System, Data, and Cache partitions and swipe to wipe. Finally, go back to the main menu and select Reboot > Recovery. Your device will now be unrooted and have a clean system partition.

Method 2: Install Android SDK on your Asus Device

If you’re trying to relock your bootloader on Asus device, you need the Android SDK. The Android SDK is a set of tools that lets you develop on the Android platform and can also help deal with an unlocked bootloader

To get started, you need to download the Android SDK. You can find the latest version of the Android SDK here:

Once you’ve downloaded the Android SDK, unzip it and run the installer. Follow the prompts to install the Android SDK.

Once the installation is complete, open up the Android SDK Manager. This is where you’ll install all of the individual components that make up the Android SDK.

In theAndroid SDK Manager, select “Tools” from the “All Packages” section. Then, check off every item in the list and click “Install Packages”. Accept any prompts that come up during the installation process.

Method 3: Enable USB Debugging and OEM Unlocking

If you want to relock the bootloader on your Asus device, you’ll need to enable USB debugging and OEM unlocking first. To do this, go to Settings > About Phone > Software Information and tap on the Build Number 7 times. This will enable Developer Options. Then, go to Settings > Developer Options and enable both USB Debugging and OEM Unlocking. Once that’s done, you can proceed with relocking the bootloader.

Method 4: Boot Your Asus Device to Fastboot Mode

If you want to relock the bootloader on your Asus device, follow these steps:

1. Boot into fastboot mode. To do this, turn off your device and then press and hold the Volume Up + Power button until you see the Fastboot logo.

2. Connect your device to your PC using a USB cable.

3. Open a command prompt or terminal window on your PC and navigate to the platform-tools folder.

4. Now type the following command: fastboot oem lock

Above Method Not working?

No Issues, you can follow the simple steps given below and We are 100% sure that you will be able to relock the unlocked bootloader of your asus phone.

Editors Choice ✅

There may be chances that fastboot OEM lock command might not be working for you, This can be an issue when 1 code is not sufficient for all asus devices. In that case you can try all the codes given below one by one.

fastboot oem asus-back
fastboot oem asus-csc_lk
fastboot flashing lock
fastboot flashing lock_critical
fastboot oem lock
fastboot oem lock_critical
fastboot flash !frp-partition! default_key.bin
fastboot oem asus-lock

Press Enter and your bootloader will be relocked!

Pros and Cons of Relocking the Bootloader

There are a few things to consider before relocking the bootloader on your Asus device. Here are some pros and cons to help you make your decision:


-It’s usually easy to do and only takes a few minutes
-Once relocked, the bootloader will be more secure and less likely to be hacked
-You may be able to receive updates from Asus more quickly


-Relocking the bootloader will void your warranty
-You will no longer be able to root your device or install custom ROMs
-If you accidentally lock yourself out of the bootloader, it can be difficult to regain access.


While it may seem like a daunting task, relocking the bootloader on your Asus device is actually quite easy. All you need is a PC with ADB and Fastboot installed, and a few minutes of your time. Once you’ve relocked the bootloader, you’ll be able to enjoy all the benefits of having an unlocked device without any of the risks. So go ahead and give it a try!

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