Good news to LG Optimus G owners, here is a tutorial about how to unlock bootloader for their devices. Regardless you bought the LG Optimus G from Sprint or AT&T in the US, this method successfully works on both two versions. In addition, the Canadian version and the Korean version can not been unlocked for now, but we believe that the author is going to work on both soon.
All credits to thecubed from XDA forum
Warning: Bootloader unlock will VOID your LG Nexus 4’s WARRANTY, I am not responsible for any damage it may cause.
All things you will need:
How to Unlock Bootloader for LG Optimus G Steps:
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i have my lg optimus g f180s stuck at LG logo, i cant start my phone. but i can enter download mode. i really would appreciate if u can show me how to make it work again