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Enter Recovery Mode

Make sure you have installed a custom recovery before

Switch the phone off
Hold the 'Volume Down' + 'Power' buttons
As soon as the LG logo appears, release the two buttons and press/hold them again
In the 'Factory hard reset' screen press the 'Power' button twice to actually enter the installed recovery system

Update custom recovery

./platform-tools/adb root
./platform-tools/adb push /tmp/cm-13.0-20160530-NIGHTLY-d802-recovery.img /data/
./platform-tools/adb shell
dd if=/data/cm-13.0-20160530-NIGHTLY-d802-recovery.img of=/dev/block/platform/msm_sdcc.1/by-name/recovery bs=1m
rm /data/cm-13.0-20160530-NIGHTLY-d802-recovery.img
exit
./platform-tools/adb reboot recovery