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How to flash Twrp:

BOOT INTO FASTBOOT MODE:

With your phone off, connect your usb cable to your phone while holding VOLUME DOWN to boot into fastboot mode or just type [adb reboot bootloader] in the adb terminal



ONCE YOU ARE IN FASTBOOT MODE:

Open a command prompt and type "fastboot flash recovery <path_to_recovery.img>” without the quotation marks.

Example: fastboot flash recovery C:/Users/John/Desktop/recovery.img

[don't forget to extract the downloaded recovery zip to get the recovery.img]



WHEN THE FLASH COMPLETES: (Takes about 2 seconds)

On your phone, unplug the usb cable and power it off by taking out the battery and putting it back in.



BOOT INTO RECOVERY MODE FOR THE FIRST TIME

HOLD VOLUME DOWN + POWER until you see the LG logo and then temporarily release the POWER button, immediately pressing and holding it back down until you see the white prompt [factory reset] screen. You will NEVER release the volume down button in this process!



Use the hard keys to select "YES" and then "YES" again to boot into TWRP

Notice: After the TWRP splash screen you will see the option to type in the password to decrypt the filesystem just ignore it and press the cancel button.