LG G4 Quick Start Manual page 3

8. Enable OEM unlock on your phone. Activating the "Enable OEM unlock" is necessary for the bootloader unlock.
To enable OEM unlock, go to Settings >> Developer options and check Enable OEM unlock.
9. Enter your phone's unique Device ID. You can view the Device ID by connecting your phone to the PC using a
USB cable and entering "adb reboot bootloader" in DOS command window of the folder you created in
previous step (for example: C:\tools). Your phone will reboot into the fastboot mode. Enter "fastboot oem
device-id" in DOS command window.
10. 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
11. Click Confirm. If your IMEI number and Device ID are valid, the bootloader unlock key will be sent to your
email.
12. Download your bootloader unlock key to your phone by connecting your phone to PC using USB cable and
entering "adb reboot bootloader" in DOS command window.
13. Your phone will reboot into the fastboot mode.
14. Go to the directory where you downloaded your bootloader unlock key.
15. Enter "fastboot flash unlock unlock.bin " in DOS command window.
"unlock.bin" is the bootloader unlock key you received in the email.
Reboot your phone by entering "fastboot reboot" in DOS command window.
16. Connect your phone to a PC using a USB cable and enter "adb reboot bootloader" in DOS command
window.
Your phone will reboot into the fastboot mode. You can check if the device is successfully unlocked, you can
check by entering "fastboot getvar unlocked" and verifying that the response is "unlocked: yes"
You can now download a custom android binary.
1. Run the desired fastboot command.
*Quick Guide
i. flash : fastboot flash
Ex) fastboot flash boot boot.img
ii. erase : fastboot erase