The above link I have provided is only for the LG Zone 2 and allows for fastboot mode to be enabled and subsequently unlock the bootloader. I had posted this method under the Clockworkmod recovery thread and made an official thread here for users to find it a bit more easily.
After you are in fastboot run fastboot oem unlock, then fastboot erase laf so when you hold vol+ and plug in the USB cable you'll have a way back to fastboot after flashing back the stock boot.img file. Please note that the bootloader still forces a signature check on all boot realated partitions including the factory partition (its another kernel and ramdisk) but other partitions can be modified at your own risk after the unlock. If you wish to flash a custom boot.img file please use the appropriate tool to sign the boot file as the method I used causes an invalid header check in the bootloader and falls back into fastboot mode.
Thank you to a tool used in linux we have now freed the LG Zone 2 and also enabled fastboot
NOTE: use the LG Optimus Fuels (lgl34c) TWRP recovery instead of CWM as this provides you a way to custom recovery though the factory reset menu. Their both the exact same phone but sold as different named devices and one is Verizon as one is Tracphone. I've personally tested this many times without any problems
NOTE: after unlocking the bootloader it's a good idea to boot to twrp and format /data as the unlock doesn't already do this
If you have questions please post here and not via PM please!