[Q] How can i unlock bootloader? - LG Optimus L90

I just installed 5.0 but i need downgrade but doesn't work this metod: http://forum.xda-developers.com/lg-l90/general/guide-flash-stock-kdz-offline-lg-l90-t2803479
so i want flash a custom rom but bootloader its locked.
anyone can help me?
PD: sorry for bad english

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Hello everyone,im seeking help to update my razr i, i am from mexico so anyone with Telcel razr i could provide STEP by STEP method to update my phone,i have unlocked the bootloader, installed CWM and rooted my phone,so any help is very appreciated, i dont wanna brick my phone,i have tried before but i dont know how to put phone on fastboot,is there a key combination? Is needed in order to flash France ics version and then OTA update right?? also once on JB is possibly to root? and CWM?
Thanks in ADVANCE and i am very sorry for my crappy low quality English
No one kind enough to Help Me?

[Q] Do i have to downgrade bootloader ?

I have jellybean installed on my phone with jellybean bootloader. I want to downgrade to ics. Do i have to downgrade the bootloader also ? If so, where can i get the ics bootloader from ?
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No.. There is no need.
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[Q] back to stock

Hi! I need some help please! I just root my phone and flashed some custom rooms but I don't like them. So , I whant to go back to stock but I don't know what to do. Do you know which is the latest room with Romanian language who can be flashed by recovery? My phone is unlocked and s-on. For this operation I have to relock the phone. I can flash this room by recovery? Sorry for the noob guestions. Thank you very much!
marriusf81 said:
Hi! I need some help please! I just root my phone and flashed some custom rooms but I don't like them. So , I whant to go back to stock but I don't know what to do. Do you know which is the latest room with Romanian language who can be flashed by recovery? My phone is unlocked and s-on. For this operation I have to relock the phone. I can flash this room by recovery? Sorry for the noob guestions. Thank you very much!
Click to expand...
Click to collapse
http://forum.xda-developers.com/showthread.php?t=2541082

Update installation. How to do?

Hello. I'm sorry for my bad english. I have a device with a locked bootloader. I downloaded the latest update (156), but I dont know how to install it via ADB. What are the commands? Where do I find a step-by-step guide?
ernia66 said:
Hello. I'm sorry for my bad english. I have a device with a locked bootloader. I downloaded the latest update (156), but I dont know how to install it via ADB. What are the commands? Where do I find a step-by-step guide?
Click to expand...
Click to collapse
You can't.
Bootloader unlock codes aren't being provided any more, unless a solid unofficial method comes along.
You need an unlocked bootloader and twrp installed to use HU Updater which isn't possible without the above

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