1. Your LG G5 (LG H850) will disable certain functions of your phone.
2. If your LG G5 (LG H850) is unlocked, this device will no longer be covered by LG warranty.
3. Your device become vulnerable.
4. After you have successfully unlock bootloader on LG G5 (LG H850) it can not be undone.

Guide Unlock Bootloader on LG G5 (LG H850).

1. Make sure your device is LG G5 (LG H850) smartphone.
2. Then go to this page.

   http://developer.lge.com/resource/mobile/RetrieveBootloader.dev?categoryTypeCode=ANRS

   lg developer - log in page

3. If you are not logged into your LG account, you will be ask to log in.
4. If you have successfully Log in to the page, 
• Your name and email address will be displayed in the form.
• On the phone drop down list, select LG H850.

  lg h850 unlock bootloader
• Then enter 15 digits your IMEI or MEID. See this guide to find your IMEI/MEID. < /span>

http://blogspot.com/2016/06/guide-how-to-find-imei-or-meid-number.html

•  Now enter your Device ID.

  Lg device information form

5. How to find Device ID ? See this guide 

http://blogspot.com/2016/08/guide-how-to-find-lg-device-id.html

6. Now click submit.
7. If your IMEI number and Device ID are valid, LG will send you the unlock key to your email on an attached file named “unlock.bin”.
8. Now download unlock.bin file to the computer, then copy this file on adb directory.
9. Then right click + Shift on empty area where you downloaded your bootloader unlock key (unlock.bin) and select open command window here.

   open command window here

10. Then type Type the following cmd into command window:
• type : adb reboot bootloader
• hit enter
• your LG G5 (LG H850) will reboot now.
• Then type : fastboot flash unlock unlock.bin
• hit en ter

  unlock bin - unlock bootloader lg G5 (LG H850)

11. Now your LG G5 (LG H850) has an unlocked bootloader.

1. From the step 9 above, you can type the following command below in command prompt windows.
• Type  fastboot getvar unlocked
• hit enter.
2. You must get the respo nse is "unlocked: yes"