How To Unlock Bootloader On LG G5 SE H840 European Variant

What is Unlock Bootloader?

A Bootloader is a code which runs when we turn on our device. This code initializes some hardware and then loads the kernel and ramdisk, and gets the boot process going. So this process is known as Bootloader. The same concept applies to all the technical stuff such as Laptop, PC, Smartphones and any such device. Every Android OEM manufacturers lock the bootloader even though it is an Open Source. So if you want to try any CUSTOM ROM, it is impossible to load the CUSTOM ROM without the Unlock Bootloader. So Manufacturer made a policy of making the smartphone with Unlocked Bootloader will void the warranty. They want you to stick with the Stock ROM. Unlock Bootloader allows you to Root your android smartphone, Flash TWRP and Custom ROM in a simple easy method.

PRE-REQUISITE TO UNLOCK BOOTLOADER ON LG G5 SE H840 European Variant

Charge your phone up to 80% or 70%
You will Loose warranty if you unlock bootloader
Unlock Bootloader may wipe all your data, So make sure to Backup your Smartphone
Make sure you have followed the steps properly. Don’t Skip and Read! – We are not responsible for any damage that you make to your phone.

What Do You Need?

Download Minimal ADB Tool – CLICK HERE or Download the Full ADB setup for Windows / Mac here
Install the Minimal ADB or Full ADB Setup (Screenshot from Minimal ADB Tool)

First of all, enable the Developer Option
To Enable the Developer Option, Go to your Settings -> About Phone -> Now Tap on the Build Number 7-8 Times until you see a toast message “Developer option enabled“
Now you need to enable the OEM Unlock by going to Settings -> Developer Option and Enable OEM Unlock
Download the Minimal ADB or Full ADB Zip and install/Extract it on your computer
Now note down the IMEI No of your device by dialing *#06# (Make sure note it down)
Turn off your phone, now boot your phone into Bootloader by pressing Volume Up + Power Button Simultaneously. Now you will see a fast boot/bootloader
Now go to the folder where you have extracted the ADB and Fastboot Tools
Plug the phone into PC using USB Cable, then open a command prompt window by pressing Shift Key + Right Mouse Click
Now turn your phone into bootloader -> Turn off your smartphone – Press and Hold Power and Volume UP button – You will see Fastboot mode – or else, you can type the command if your device is in ADB mode. ( phone should be turned on and connected to PC via USB Cable.)
```
adb reboot bootloader
```
If you are booted into fast boot, type the command below in CMD screen.
```
fastboot devices
```
This command will list the connected devices. If your phone serial number shows up you are good to go and may continue. If the phone is NOT listed this indicates that your drivers or cables are not installed correctly. if you want to continue, you must first fix your problem.
If the phone has been recognized by the command above, proceed to unlock the bootloader. Remember, this step will wipe EVERYTHING off the phone. Take backup. In your command window, type
```
fastboot oem device-id
```

This fastboot command will return a character string. This is the Device ID which is needed to generate your unique unlock key.

Example Device ID (PC user)$ fastboot oem device-id
(bootloader)—————————————————————–
(bootloader) Device-ID
(bootloader) CD58B679A38D6B613ED518F37A05E013
(bootloader) F93190BD558261DBBC5584E8EF8789B1
(bootloader)—————————————————————–

To generate your unlock key, you will need to paste together the 2 lines of output into one continuous string without “(bootloader)” or white spaces. In the example above, the Device ID would be:

CD58B679A38D6B613ED518F37A05E013F93190BD558261DBBC5584E8EF8789B1

Now open the official Unlock Bootloader Website of LG: Click here to open

Click Starting Unlocking the Bootloader at the bottom of this page to start the bootloader unlock process. If you are not logged into your account, we ask that you log in.

If you didn’t register with your email id.

After register click the Starting Unlock Button again
Click Unlock

Now you will have a screen to type your IMEI no, name and Device ID. Now enter the IMEI number which you note down.

Paste the Device ID(Continuous String you created in step 13) in the Unlock Bootloader website of LG unlock Lg

Click Confirm. If your IMEI number and Device ID are valid, the bootloader unlock key will be sent to your email.

Now open the email and check for the mail sent by LG developer.

In your email, you will find the attachment with unlock.bin, download and move the unlock.bin attachment to ADB and Fastboot folder

Enter the command in the command window.

Now when the phone is still in Fastboot mode/ Bootloader, enter the command below (“unlock.bin” is the bootloader unlock key you received in the email.)

fastboot flash unlock unlock.bin

You have unlock Bootloader on LG G5 SE H840 European Variant.

Reboot your phone by entering “fastboot reboot” in the command window.

To check if your device has unlocked the bootloader, then Connect your phone to a PC using a USB cable and enter “adb reboot bootloader” in ADB command window.

Your phone will reboot into the fastboot mode. You can check if the device is successfully unlocked, you can check by entering command below and verifying that the response is “unlocked: yes”

fastboot getvar unlocked

Now you can reboot your phone by entering the command

fastboot reboot-bootloader

Click Enter and That’s it! Voila.! You have unlocked bootloader !

You have completed the steps for How to Unlock Bootloader on LG G5 SE H840 European Variant.

How To Unlock Bootloader On LG G5 SE H840 European Variant

What is Unlock Bootloader?

PRE-REQUISITE TO UNLOCK BOOTLOADER ON LG G5 SE H840 European Variant

What Do You Need?

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