Unlocking bootloader - LG G2 Mini

Could anybody write instruction step by step for unlocking bootloader? I have a problems with understanding this
HTML:
http://forum.xda-developers.com/g2-mini/development/bootloader-unlock-t2827748

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Here are the instructions written by @Zaaap72 :
Zaaap72 said:
If you want to try on your own: (Do it on your own risk)
Code:
Get aboot.img and abootb.img:
dd if=/dev/block/platform/msm_sdcc.1/by-name/aboot of=/sdcard/aboot.img
dd if=/dev/block/platform/msm_sdcc.1/by-name/abootb of=/sdcard/abootb.img
Open each with a hex editor.
Search for the byte chain 20 00 EB 00 00 50 E3 E0 FF FF 0A
Make sure that it exists only once.
Replace the next 4 byte by DF FF FF EA.
You will get: 20 00 EB 00 00 50 E3 E0 FF FF 0A DF FF FF EA
Save aboot.img as aboot4.img and abootb.img as abootb4.img
[COLOR="Red"][B]Do it on your own risk![/B][/COLOR]
Flash them back:
dd if=/sdcard/aboot4.img of=/dev/block/platform/msm_sdcc.1/by-name/aboot
dd if=/sdcard/abootb4.img of=/dev/block/platform/msm_sdcc.1/by-name/abootb
If you don't understand this instructions then don't even try it!
Zaaap
If you try it, do it on your own risk.
I'm not responsible if you brick your device.
Click to expand...
Click to collapse
If you need any help ask at his thread or here.
Sent from my D620R [Stock 4.4.2]

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I need a help with all of it
When I want to take out and modify aboot.img and abootb.img I must use root explorer, right?
And when I will be editing thoose files I must do this at phone using hex editor or on my computer?
And one question about putting it into the phone... For this I must use root explorer?
Or maybe You have thoose files? In this way I could flash them instead of my files

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debowiakr said:
I need a help with all of it
When I want to take out and modify aboot.img and abootb.img I must use root explorer, right?
And when I will be editing thoose files I must do this at phone using hex editor or on my computer?
And one question about putting it into the phone... For this I must use root explorer?
Click to expand...
Click to collapse
[Q] Why would you want to unlock bootloader?
If you are not a developer you will have no use for it at the moment.
Answers:
A) No, you don't need root explorer.
B) You need a terminal emulator or use adb.
C) You can use what ever hex editor you like, i did it on my pc using HxD.
D) Like A) and B).
E) I don't know what phone you have, so i don't know what files you need and you don't know how to use them.
F) ! Don't do it. You might brick your phone for no reason !

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So I shouldn't do that at the moment?
Maybe You're right, I won't do that but thanks for help
My phone is Lg D620r

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debowiakr said:
So I shouldn't do that at the moment?
Maybe You're right, I won't do that but thanks for help
My phone is Lg D620r
Click to expand...
Click to collapse
Since we have no custom recovery/kernel/rom you can do nothing extra with the unlocked bootloader.
As soon as we have some thing usefull, I'm sure some one will write a guide for it.
File for LG D620r is attached to the thread as it is what i have.
Zaaap

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How do I check if my recovery is unlocked?

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luk45 said:
How do I check if my recovery is unlocked?
Click to expand...
Click to collapse
I don't know any official way to tell if your bootloader is locked or not.
I modified an extracted boot.img (kernel) and flashed it back.
Then i flashed a custom kernel build by Garcia.
In both cases I didn't get a security error and the phone booted.
This custom kernel is not ready for use now, but it is a prove of concept and promising for the future.
If you are not a developer or plan to start developing there is no use of an unlocked bootloader at the moment.
Zaaap
Sent from my LG-D620 using XDA Premium 4 mobile app

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Sorry, for bringing up this old thread, but I found something very interesting and this thread seems fitting.
Apparently, there is this thing called LGTool. It can do a lot of things for various models, including unlocking the bootloader. List of officially supported devices.
Also,
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Sent from my D620r [Stock 4.4.2 , -V- Kernel]